Language

Complex Sentences & Conjunctions

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The Spark

Concept

A complex sentence has a main clause (which makes sense on its own) and a subordinate clause (which adds extra information but cannot stand alone). They are joined by a subordinating conjunction such as because, although, when, while, since, unless, until.

Activity

Say to your child: I stayed inside. Ask them to add more information using because. Notice how the sentence becomes richer.

Check

Check that your child can identify the main clause and the subordinate clause in each sentence they write.

Choose the Best Conjunction (Set A)

Circle the conjunction that makes the most sense in each sentence.

Lily packed an umbrella ___ it was raining.

although

because

until

___ the film was long, we enjoyed every minute.

Although

Since

When

We will stay at the park ___ the sun sets.

while

until

because

He practised the piano ___ he could play the whole song.

although

unless

until

You cannot go outside ___ you finish your lunch.

because

unless

while

TipRead each sentence aloud with all three options to hear which sounds correct.

Sort the Conjunctions (Set A)

Sort these conjunctions into the correct group based on the kind of relationship they show.

because

although

when

since

while

even though

until

after

despite

Time

Reason

Contrast

Match the Conjunction to Its Function

Draw a line to match each conjunction to what it shows.

because

although

until

while

since

even though

contrast — the ideas are opposite

time — one thing happens at the same time

reason — explains why

contrast — same as although

time — one thing ends then another starts

reason — another way to say because

TipReview the Time / Reason / Contrast categories before matching.

Finish the Sentence (Set A)

Each sentence has a main clause. Complete each one with a subordinate clause. Use a different conjunction each time.

1. The cat jumped onto the fence ___

2. ___ , James could not sleep.

3. We had a picnic ___ it was sunny.

4. She practised every day ___ she won the competition.

Main Clause or Subordinate Clause?

Read each clause. Circle M if it is a main clause (can stand alone) or S if it is a subordinate clause (cannot stand alone).

Because it was raining

The dog barked loudly

Although she was tired

We went to the shops

Until the teacher arrived

Tom packed his bag

Sort: Main Clause or Subordinate Clause?

Sort each clause into the correct column.

because the storm was coming

the children played outside

although it was late

she opened the door

until the whistle blew

the teacher smiled

while we waited

he finished his homework

Main clause (can stand alone)

Subordinate clause (cannot stand alone)

Expand Simple Sentences (Set A)

Rewrite each simple sentence as a complex sentence by adding a conjunction and a subordinate clause.

Example: The bird sang. Answer: The bird sang because the sun was rising. 1. The children ran. Answer:

2. Tom ate dinner. Answer:

3. She smiled. Answer:

TipShow the example before your child writes independently.

Choose the Best Conjunction (Set B)

Circle the best conjunction for each sentence.

We stayed inside ___ it was too hot to go out.

although

because

until

___ she finished reading, she put the book down.

Before

Although

When

He will not come ___ you invite him.

until

unless

while

___ it was her birthday, she still had to do her chores.

When

Even though

Because

Match Sentence Halves

Draw a line to match each main clause with the best subordinate clause.

She wore a raincoat

He finished his vegetables

We played outside

She sang a lullaby

They arrived early

although it was cold

because it was forecast to rain

before the other guests

until the baby fell asleep

so that he could have dessert

TipRead each combination aloud before drawing the line.

Write Complex Sentences with Time Conjunctions

Write two complex sentences using time conjunctions — one with 'before' and one with 'after'.

Before:

After:

Sort Conjunctions by Type (Extended Set)

Sort each conjunction into its correct group.

before

since

despite

after

while

until

because

though

whenever

even though

unless

Time

Reason

Contrast

Identify Clauses

Read each complex sentence. Underline the main clause (MC) and put brackets around the subordinate clause (SC).

1. Although it was raining, the match continued.

2. She practised every day because she wanted to improve.

3. He will not eat his dinner unless you add tomato sauce.

4. While the dog slept, the cat crept across the kitchen.

Subordinate Clause at the Front

When a subordinate clause comes first, it is followed by a comma. Rewrite each sentence so the subordinate clause comes first, adding a comma.

She studied hard because she wanted to do well. Rewritten:

He arrived early so that he could get a good seat. Rewritten:

They went inside when it started to rain. Rewritten:

Front-loaded or End-loaded Subordinate Clause?

Circle F if the subordinate clause is at the front of the sentence, or E if it is at the end.

Although it was late, she kept reading.

He went to bed after he brushed his teeth.

Before the show started, the audience fell silent.

She smiled even though she was nervous.

When the alarm rang, everyone evacuated.

Combine Simple Sentences

Join each pair of simple sentences into one complex sentence using an appropriate conjunction.

The wind was howling. We could not hear each other. Complex sentence:

She loves swimming. The water is cold. Complex sentence:

He forgot his umbrella. He got soaked. Complex sentence:

Sort: Comma Needed or Not?

In complex sentences, a comma is needed when the subordinate clause comes FIRST. Sort each sentence.

Although she was tired she kept going.

She kept going although she was tired.

Because it rained the match was cancelled.

The match was cancelled because it rained.

When he arrived everyone cheered.

Everyone cheered when he arrived.

Comma needed (SC at front)

No comma needed (SC at end)

Write With a Variety of Conjunctions

Write a complex sentence using each conjunction listed. Make them about different topics.

because:

although:

whenever:

unless:

since:

Which Conjunction Fits Best? (Set C)

Choose the conjunction that creates the most logical sentence.

She ate breakfast ___ she left for school.

before

although

unless

The bridge was dangerous ___ it was very old.

although

because

until

___ the scientist worked hard, she made no progress.

Because

Although

Until

He plays piano ___ he practises every evening.

until

although

because

Sort: Which Relationship Does the Conjunction Show?

Read each complex sentence and sort it by the relationship the conjunction creates.

She cried when she heard the news.

Although he tried, he could not lift the box.

He ran because he was late.

She waited until her name was called.

Even though the food was cold, he ate it all.

Since it was raining, they moved inside.

Time

Reason

Contrast

Paragraph with Complex Sentences

Write a short paragraph (4–5 sentences) about a rainy day. Include at least three different subordinating conjunctions. Underline each conjunction.

My paragraph:

Draw here

Conjunctions I used:

Fix Faulty Complex Sentences

Each sentence below has an error — a missing conjunction, a missing comma or a fragment. Rewrite it correctly.

1. She put on her coat. Was cold outside. Corrected:

2. Although he studied all night he still forgot some answers. Corrected:

3. Because he wanted to be first he left early and arrived on time. Corrected:

Match Sentence Halves (Set B)

Draw a line to match each sentence opening with the best ending.

He stayed in bed

She ran every morning

Although the test was hard,

Unless you hurry,

Since she moved schools,

you will miss the bus.

she has made many new friends.

she finished every question.

because he had a fever.

so that she could train for the marathon.

Subordinate Clause Position

Rewrite each sentence twice — once with the subordinate clause at the end, and once with it at the front (adding a comma).

Base idea: She won the race. She had trained for months. SC at end:

SC at front (with comma):

Conjunctions in Persuasive Writing

Circle the conjunction that makes the persuasive sentence more effective.

You should exercise daily ___ it improves both physical and mental health.

although

because

unless

___ some people think homework is unnecessary, research shows it builds discipline.

Because

Although

When

Children will benefit from cooking lessons ___ they practise at home too.

because

although

TipIn persuasive writing, contrast conjunctions can add power to an argument.

Complex Sentences in Different Text Types

Write one complex sentence for each text type. Use a different conjunction each time.

Narrative (story): Use 'while':

Persuasive text: Use 'although':

Information text: Use 'because':

Recount: Use 'after':

Sort Sentences by Type

Sort each sentence into the correct column.

The cat sat on the mat.

Although it was late, she kept reading.

He ate his lunch.

She waited until the bell rang.

The sun set.

Because he was hungry, he made a snack.

Birds sang in the trees.

While she painted, her brother read.

Simple sentence

Complex sentence

Improve a Choppy Paragraph

Rewrite this paragraph, joining some simple sentences into complex sentences using conjunctions. Aim for three complex sentences.

Original: The storm came. We stayed inside. The power went out. It was dark. We found some candles. We played board games. Your improved paragraph:

Draw here

Conjunction Challenge

Look for and practise complex sentences in everyday reading.

1Find a complex sentence in a book you are reading. Identify the main clause and subordinate clause.
2Set a timer for 2 minutes and write as many complex sentences as you can using a new conjunction each time.
3Say a simple sentence out loud, then challenge a family member to extend it using a conjunction.
4Highlight all conjunctions in a paragraph from a library book — which ones appear most often?

Analyse a Complex Sentence

Read this complex sentence and answer the questions about it.

SENTENCE: Although the scientists had worked on the project for ten years, they were still unable to find a cure. Main clause:

Subordinate clause:

Conjunction:

What relationship does the conjunction show (time / reason / contrast)?

Who, Which or That?

Circle the correct relative pronoun.

The dog ___ ran away was found by a kind neighbour.

who

that

which

The stadium, ___ was renovated last year, holds 50,000 people.

that

who

which

She is the scientist ___ discovered the new element.

which

who

that

The book ___ I borrowed was overdue.

who

which

that

Add Relative Clauses

Expand each simple sentence by adding a relative clause using who, which or that.

The teacher wrote on the board. Expanded:

The old house stood at the end of the street. Expanded:

The astronaut returned to Earth. Expanded:

Sort: Subordinating Conjunction or Relative Pronoun?

Sort each word that introduces a subordinate clause.

because

who

although

which

when

that

since

unless

who

Subordinating conjunction

Relative pronoun

Complex Sentence Crafting

Write three complex sentences about the same topic — an animal of your choice. Use a time, a reason and a contrast conjunction.

My animal:

Time conjunction sentence:

Reason conjunction sentence:

Contrast conjunction sentence:

Sentence Combining: Advanced

Join these pairs of ideas into one complex sentence. You may move the ideas around for best effect.

Idea A: The volcano had been dormant for centuries. Idea B: Scientists were surprised when it erupted. Complex sentence:

Idea A: Mia had never played chess before. Idea B: She beat the school champion on her first try. Complex sentence:

Most Effective Complex Sentence

Circle the complex sentence that is most effective and explain why.

Which version is most effective?

She was tired. She kept going.

She kept going although she was exhausted.

She kept going and she was tired.

Which version is most effective?

The snow fell. It covered everything.

The snow fell and it was cold.

As the snow fell silently, it covered the entire valley in white.

Sort Sentences: Simple, Compound or Complex?

Sort each sentence into its type.

The rain fell.

She sang and he played guitar.

Although it was late, she kept reading.

The dog barked loudly.

He tried hard but he could not lift the box.

Because she studied every night, she aced the exam.

Birds flew past.

She called him but he did not answer.

When the alarm rang, everyone left calmly.

Simple

Compound (and/but/or)

Complex (subordinating conjunction)

Write a Varied Paragraph

Write a paragraph about a visit to a new place. Include at least one simple sentence, one compound sentence and two complex sentences. Label each sentence type in the margin.

My paragraph:

Draw here

Match Formal Conjunctions to Their Meanings

Draw a line to match each formal conjunction with its meaning.

consequently

nevertheless

furthermore

therefore

however

despite this / but

as a result of this

in addition / and also

so / as a result

in contrast / on the other hand

TipThese formal connectives appear in academic and informational writing.

Conjunctions in a Recount

Write a five-sentence recount of something that happened to you recently. Use at least three different conjunctions and underline each one.

My recount:

Draw here

Conjunctions used:

Complex Sentence Spotter

Find complex sentences in everyday texts this week.

1Find three complex sentences in a newspaper or magazine article and identify the conjunction in each.
2Write five complex sentences about your day, varying whether the subordinate clause comes first or last.
3Read a paragraph from a chapter book aloud — how many conjunctions can you find?
4Rewrite a paragraph from a book using different conjunctions — how does the meaning change?

Embedded Subordinate Clauses

An embedded clause sits in the middle of a sentence, separated by commas. Add an embedded clause to each sentence.

The old house _____ stood at the edge of the cliff. Add an embedded clause (who/which):

The scientist _____ won the Nobel Prize. Add an embedded clause:

Sort: Types of Subordinate Clause

Sort each underlined clause by type.

After the show ended, we went home.

She won because she had trained hardest.

Although it was expensive, she bought it.

The artist, who painted at dawn, was famous.

He waited until she arrived.

The book that she recommended was sold out.

Since he was unwell, he stayed home.

Even though the team lost, they were proud.

Time clause

Reason clause

Contrast clause

Relative clause

Conjunctions in Argument Writing

Write a three-sentence argument on the topic 'School uniforms should be compulsory'. Use one contrast conjunction, one reason conjunction and one time/condition conjunction. Label each.

Sentence 1 (contrast conjunction _____):

Sentence 2 (reason conjunction _____):

Sentence 3 (condition conjunction _____):

Edit for Conjunction Variety

Read this paragraph. It uses 'because' too often. Rewrite it, replacing two 'because's with different conjunctions that still make sense.

Original: He loved the sea because it was beautiful. He went swimming every day because he wanted to stay fit. He never surfed because he was afraid of big waves. Rewritten:

Draw here

Multi-clause Sentences

Write two sentences that each contain a main clause and TWO subordinate clauses. Use a different pair of conjunctions each time.

Sentence 1 (conjunctions: _____ and _____):

Sentence 2 (conjunctions: _____ and _____):

Complex or Compound-Complex?

A compound-complex sentence has two main clauses AND at least one subordinate clause. Circle CC (compound-complex) or C (complex).

She studied hard and she passed the exam because she was determined.

Although it was raining, the match continued.

He cooked dinner while she set the table, and they ate together when the food was ready.

Because the trail was steep, they rested often.

Analyse Complex Sentences in a Text

Read a paragraph from a book or article. Find two complex sentences and analyse each one.

Complex sentence 1 (copy it out):

Main clause: Subordinate clause: Conjunction:

Complex sentence 2 (copy it out):

Main clause: Subordinate clause: Conjunction:

Sort Conjunctions: Formal vs Informal Register

Sort each conjunction or connective by whether it is more formal or informal.

consequently

because

nevertheless

even though

furthermore

and also

therefore

Formal register

Informal register

Persuasive Writing: Conjunction-Rich Paragraph

Write a persuasive paragraph arguing that children should spend more time outdoors. Use at least five different conjunctions — time, reason, contrast, condition and relative. Underline each conjunction.

My paragraph:

Draw here

Reflecting on Sentence Structure

Look at a piece of your own writing. Answer these questions about your use of conjunctions.

Which conjunctions did you use most often?

Which types (time/reason/contrast) did you underuse?

Rewrite one sentence from your work using a different conjunction:

How does the new conjunction change the meaning or tone?

Purpose Clauses

Write four sentences using purpose conjunctions: so that, in order to, in case, provided that.

so that:

in order to:

in case:

provided that:

Sort Conjunctions: Logical Relationship

Sort each conjunction by the logical relationship it expresses.

because

although

so that

since

even though

unless

in order to

despite

provided that

in case

Cause/reason

Contrast/concession

Condition

Purpose

Complex Sentences: Final Story Challenge

Write a 10-sentence story about an explorer who discovers a lost civilisation. Use at least 8 different subordinating conjunctions. Highlight each conjunction in a different colour by type.

My story:

Draw here

Grammar Reflection: What I Have Learned

Answer these questions to reflect on what you have learned about complex sentences and conjunctions.

In your own words, what is a complex sentence?

What is the difference between a main clause and a subordinate clause?

Give one example each of a time, reason and contrast conjunction:

How will you use complex sentences in your next piece of writing?

Final Sort: Complex Sentence Features

Sort each feature into the correct column.

Can stand alone as a sentence

Begins with a subordinating conjunction

Contains the main idea

Cannot stand alone

Is the most important clause

Adds extra information

Makes complete sense by itself

Begins with 'because', 'although' or 'when'

Feature of a main clause

Feature of a subordinate clause

Conjunction Mastery Challenge

Apply complex sentence skills in real-world writing.

1Write a letter to your future self using at least six different conjunctions.
2Find three examples of embedded relative clauses in books or newspapers.
3Rewrite a paragraph using only simple sentences — then rewrite it again with complex sentences. Compare the effect.
4Create a conjunction reference card to keep near your writing space.