Sentence Structure and Complex Sentences

Learning goals

By the end of this module, you will be able to identify independent and dependent clauses, recognise common sentence patterns, and combine ideas into clear complex sentences. You will also practise identifying sentence fragments and run-on sentences.

Step 1 — Read and discover

Read the passage. Notice how the writer combines short statements with clauses that explain reasons, conditions and results.

Why study habits matter

Students often assume that successful learning depends mainly on the number of hours they spend studying. However, the way they organise those hours can be just as important. A student who reviews material regularly may remember more than someone who studies for a long time only before an examination. This happens because regular practice gives the brain several opportunities to retrieve information.

Although some learners prefer to study in complete silence, others work effectively in places where there is a little background noise. The best environment depends on the individual and on the task. When students need to understand a difficult argument, they may benefit from a quiet space; when they are reviewing familiar material, a different setting may be suitable.

Study plans can also help, provided that students use them flexibly. If a plan is too strict, an unexpected problem may make it difficult to follow. Students should therefore set realistic goals and adjust their plans when necessary. Effective learning is not simply a matter of working harder. It involves choosing useful strategies, checking progress and changing an approach when the evidence suggests that it is not working.

Check your understanding

1. What is the main point of the passage?Try again

A. Students should always study in silence.B. The way students study can matter as much as the time they spend.C. Students should avoid making study plans.

1. What is the main point of the passage?

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2. Why can regular practice help students remember information?Try again

A. It gives them repeated opportunities to retrieve information.B. It removes the need to review material.C. It makes every task easier.

2. Why can regular practice help students remember information?

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3. According to the passage, what should students do when a plan is not working?Try again

A. Follow it without changes.B. Stop studying completely.C. Adjust their approach when necessary.

3. According to the passage, what should students do when a plan is not working?

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Step 2 — Understand the grammar

1. Clauses: the basic building blocks

A clause contains a subject and a verb.

Independent clause: expresses a complete idea and can stand alone. Regular practice improves memory.
Dependent clause: has a subject and a verb but cannot normally stand alone. Because students practise regularly.

A dependent clause needs to connect to an independent clause: Because students practise regularly, they may remember more.

2. Three useful sentence patterns

Simple sentence: one independent clause. Students review their notes.
Compound sentence: two independent clauses joined correctly. Students review their notes, and they test their memory.
Complex sentence: an independent clause and at least one dependent clause. Students remember more when they test their memory.

A sentence can contain more than one independent or dependent clause, so these patterns can become more elaborate.

3. Common ways to introduce dependent clauses

Relationship	Common words	Example
Reason	because, since	Students took a break because they felt tired.
Contrast	although, while	Although the task was difficult, the group completed it.
Time	when, after, before	Review your notes after you finish the lecture.
Condition	if, unless	If the evidence changes, the conclusion may change.
Purpose	so that	They recorded the results so that others could check them.

4. Avoid fragments and run-on sentences

A fragment is an incomplete sentence: Although the sample was small. Add an independent clause: Although the sample was small, the results were useful.

A run-on sentence joins independent clauses without correct punctuation or a suitable linking structure: The sample was small the researchers repeated the study. Correct it with a full stop, a semicolon, or a conjunction: The sample was small, so the researchers repeated the study.

Key terms

clause

core concept

A group of words containing a subject and a verb.

“The results changed because the conditions were different.”

The sentence contains two clauses: an independent clause and a dependent clause.

independent clause

clause type

A clause that can stand alone as a complete sentence.

“The researchers recorded the results.”

It expresses a complete idea.

dependent clause

clause type

A clause that normally cannot stand alone as a complete sentence.

“Although the sample was small”

Connect it to an independent clause: Although the sample was small, the results were useful.

simple sentence

sentence pattern

A sentence containing one independent clause.

“Students review their notes.”

A simple sentence can still have a compound subject or verb.

compound sentence

sentence pattern

A sentence joining two or more independent clauses correctly.

“Students review their notes, and they test their memory.”

Use a coordinating conjunction or suitable punctuation.

complex sentence

sentence pattern

A sentence containing an independent clause and at least one dependent clause.

“Students remember more when they test their memory.”

The dependent clause explains a relationship such as time, reason, contrast or condition.

sentence fragment

common error

An incomplete sentence presented as if it were complete.

“Although the sample was small.”

Add an independent clause to complete the idea.

run-on sentence

common error

Two independent clauses joined without correct punctuation or a suitable connector.

“The sample was small, so the researchers repeated the study.”

A full stop, semicolon or conjunction can correct many run-ons.

subordinating conjunction

grammar term

A word that introduces a dependent clause and shows its relationship to another clause.

“Although the task was difficult, the group completed it.”

Common examples include because, although, when, if and unless.

clause punctuation

writing skill

Punctuation used to show how clauses connect within a sentence.

“If the figures are accurate, the report can be published.”

A dependent clause at the beginning is usually followed by a comma.

Step 3 — Identify the sentence pattern

Choose the best answer, then check your choices.

Step 4 — Complete the sentences

Type the missing word or phrase. More than one answer may be accepted when it fits the sentence.

1. the sample was small, the researchers reported the findings cautiously.Try again✓

2.The group repeated the test they could check the result.Try again✓

3.Students often understand a text better they identify its main argument.Try again✓

4.The first explanation was unclear, the lecturer gave another example.Try again✓

5. the results are confirmed, the team will publish its report.Try again✓

6.The method was useful it allowed the team to compare several cases.Try again✓

7.The plan may fail students do not have enough time to complete each task.Try again✓

8.The researchers checked the figures before they drew a conclusion.Try again✓

Step 5 — Correct the sentence

Choose the best correction or answer.

Step 6 — Combine the ideas

Join the ideas into one sentence using the word in brackets. Write a complete sentence.

1.The evidence was limited.The researchers avoided a strong conclusion.(Use: because)

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2.The task was demanding.The students completed it.(Use: although)

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3.Check the figures.You submit the report.(Use: before)

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4.The team records each stage.Other researchers can repeat the process.(Use: so that)

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5.The results are confirmed.The researchers will share them.(Use: if)

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Step 7 — Quick review

Choose the best answer for each question.