Cause first
Because the road was flooded, the bus turned back. The reason is foregrounded.
What students learn
A clause contains a subject and predicate. A main clause can stand alone as a complete thought. A dependent clause cannot stand alone in the same meaning and is often introduced by a subordinating conjunction such as because, although, when, while, if, unless, until or after.
Success criteria
- identify main and dependent clauses
- distinguish a clause from a phrase
- distinguish simple, compound and complex sentences
- choose subordinators that express the intended relationship
- punctuate an opening dependent clause clearly
- explain how clause order changes emphasis or effect
Main clause, dependent clause or phrase?
| Type | Example | Test |
|---|---|---|
| Main clause | The hikers rested. | Can stand alone. |
| Dependent clause | because the track was flooded | Has a subject and verb but leaves the thought incomplete. |
| Phrase | under the old bridge | No complete subject–predicate relationship. |
Trap: sentence length does not decide sentence type.
Subordinators show relationships
- Time: when, while, after, before, until
- Cause: because, since
- Condition: if, unless
- Contrast: although, though
Changing the subordinator can change the meaning: Because gives a reason; although creates contrast.
Simple, compound and complex sentences
- Simple: one independent clause — “The dog barked.”
- Compound: two independent clauses — “The dog barked, and the baby woke.”
- Complex: a main clause plus at least one dependent clause — “When the dog barked, the baby woke.”
Test whether each clause can stand alone rather than relying only on conjunction words.
Clause order, punctuation and effect
Result first
The bus turned back because the road was flooded. The result is presented before its explanation.
Contrast first
Although Priya felt nervous, she stepped onto the stage. The opening dependent clause creates an expectation that the main clause then challenges.
When a dependent clause comes first, a comma normally separates it from the main clause.
Common misconceptions
- Long sentences are not automatically complex sentences.
- A phrase is not a clause unless it has the required clause structure.
- The first clause is not always independent.
- Compound and complex sentences are not the same.
- Subordinators are not interchangeable because they express different relationships.
Learning progression and next steps
This skill builds from recognising clauses toward deliberately controlling sentence meaning and emphasis in writing. Continue through the Year 5 English curriculum hub, then consolidate AC9E5LA05 with the worksheet, practice set and separate test.
Curriculum and research note
AC9E5LA05: understand that the structure of a complex sentence includes a main clause and at least one dependent clause, and understand how writers can use this structure for effect.
SkillrHub teaches both the structural foundation and age-appropriate authorial effect through clause order, punctuation and meaning.
🎥 Optional Video Lesson
The SkillrHub lesson remains the primary learning resource. This optional video reinforces the explanation; you can complete the lesson and practice without watching.
Before you watch:
- Pause after each worked example.
- Try the examples yourself.
- Return to the SkillrHub lesson before continuing.
Recommended: Complex Sentences
Khan Academy — Connect a main clause with a dependent clause to express a more precise relationship.
As you watch: Which clause can stand alone, and what does the dependent clause add?
Load video player Loads YouTube in this lesson. See the video notice below.
Try it: Write one complex sentence beginning with although and another beginning with because; underline each main clause.
Video unavailable, inaccurate or unsuitable for this year? Report a video problem to SkillrHub by email. You can continue with the written lesson and practice resources.
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