Skip main navigation

Complex structures

Learn about using a range of complex grammar structures in the IELTS speaking test. Improve your band score in Grammatical range and accuracy.
student speaking to teachers while holding laptop (as seen through glass wall)
© Macquarie University

One of the main aspects you are assessed under Grammatical range and accuracy is the use of complex structures.

This is an area in which Ari did not perform well in his first set of responses. Most of the sentences that he used were simple sentences. These are sentences which only contain one clause (i.e. one subject + one verb). For example:

Many universities do this now.
In his second attempt, Ari added a range of more complex structures, which would help him achieve a higher score. For example:
It is true that many universities do this now but in the future, I think that the online content will become more integrated.
Let’s learn more about complex structures and see how you can integrate them into your responses in all parts of the speaking test.

Complex sentences

As we saw in the example above, a simple sentence contains one clause; that is, one subject paired with one verb. Complex sentences, on the other hand, contain two or more subject + verb combinations. Look at Ari’s sentence taken from his improved response. How many subject + verb combinations (or clauses) can you identify?
If you said three, you are correct. The clauses used are: It is…, I think… and the online content will become…, and they were connected using subordinators and coordinators (e.g. that, but).
Complex sentences are key to achieving a high score for Grammatical range and accuracy. If you only speak in simple sentences with a limited range of complex structures, you cannot get more than a Band 5. For a Band 6, you need to use a mix of simple and complex structures. A Band 7 requires a range of complex structures, while for a Band 8 you need to use a wide range.
There are three types of complex sentences:
  • Adverb clauses: These work as adverbs and they can show a number of different relationships between the clauses in the sentence (e.g. contrast, time, reason).
  • Noun clauses: They function as nouns, and as such, they can be subjects or objects in sentences.
  • Adjective clauses: These function as adjectives and provide extra information about a noun.

The table below shows the different types of complex sentences and some examples. For more detailed information, download and keep the complex sentences document below.

Type of complex sentence Example sentence
Adverb clauses Doctors save lives while the sportspeople only entertain.
Noun clauses I am not sure how university education will change in the future.
Adjective clause I would study medicine and then become a doctor who helps children around the world.

There are other ways in which you can show complexity in your ideas:

Comparative structures

It is common to be asked questions that prompt you to use comparative and superlative forms. If the examiner asks you to compare and/or contrast something, it is important to use these forms in your answer as they give you chance to show grammatical range. Let’s have a look at some of these.

(not) as + adjective + as: This structure can be used to compare and contrast:

My sister is as tall as me.

Many people prefer not to walk as far as they used to.

Comparative adjectives: These can be used to compare one noun to another noun. In these instances, only two items are being compared.

I think being a doctor is a better job for me than teaching.

Superlative adjectives: These are used to describe the noun that is at the highest or lowest limit of the group of nouns.

I think that being a doctor is the best job for me.

Passive voice

Passive voice allows you to show grammatical range. It is formed using the verb to be and the past participle of the verb. It focuses on the results of the action rather than who performed the action. Here are some example passive voice sentences that Ari could have used:

  • Sports equipment shouldn’t be paid for by the government.

  • More online content will be integrated into courses by universities.

  • It isn’t fair that sportspeople are paid more than doctors and nurses.

Modal verbs (i.e. can, could, should, must) can show a range of information and they can help you produce complex structures. Here are some examples:

  • Because of this, they can’t keep up with the assignments.
  • I don’t think that they should pay for this.

Try the following quiz to check your understanding of these complex structures.

© Macquarie University
This article is from the free online

Improve your IELTS Speaking score

Created by
FutureLearn - Learning For Life

Our purpose is to transform access to education.

We offer a diverse selection of courses from leading universities and cultural institutions from around the world. These are delivered one step at a time, and are accessible on mobile, tablet and desktop, so you can fit learning around your life.

We believe learning should be an enjoyable, social experience, so our courses offer the opportunity to discuss what you’re learning with others as you go, helping you make fresh discoveries and form new ideas.
You can unlock new opportunities with unlimited access to hundreds of online short courses for a year by subscribing to our Unlimited package. Build your knowledge with top universities and organisations.

Learn more about how FutureLearn is transforming access to education