Expressing purpose in English : complete course

What Does ‘Expressing Purpose’ Mean in English?

When we talk about expressing purpose in English, we mean explaining why someone does something. It answers the question: ‘What is the goal or reason behind this action?’ This is a key part of communication in everyday life.

For example, if you say ‘I study English to find a better job’, you are expressing a purpose. The purpose is finding a better job.

Simple Examples to Get Started

• She goes to the gym to stay healthy.
• He saved money in order to buy a new phone.
• They left early so that they could catch the train.
• I wrote a list so as not to forget anything.

As you can see, there are several ways to express purpose in English. Let us look at the main ones.

The Key Elements of Expressing Purpose in English

In English, you can express purpose using different structures. Each one is slightly different in form or level of formality. Here are the most common ones.

1. Using ‘To’ + Infinitive

This is the simplest and most common way to express purpose. You just use ‘to’ followed by the base form of the verb.

• I called him to apologise.
• She opened the window to get some fresh air.
• We bought a map to find the way.

This structure is used when the subject of both verbs is the same person.

2. Using ‘In Order To’ and ‘So As To’

These expressions are slightly more formal. They are common in written English and give a more precise or emphatic meaning.

• He spoke slowly in order to be understood.
• She arrived early so as to get a good seat.
• They trained hard in order to win the competition.

Note: In the negative form, you say ‘in order not to’ or ‘so as not to’.

• She whispered so as not to wake the baby.
• He checked his work in order not to make mistakes.

3. Using ‘So That’ + Subject + Verb

Use ‘so that’ when the subject changes between the two parts of the sentence. It is also used to talk about a desired result. It is often followed by ‘can’, ‘could’, ‘will’, or ‘would’.

• I explained the rules so that everyone could understand.
• She saved money so that her children could go to university.
• Please speak clearly so that the audience can follow you.

Why Expressing Purpose Matters in English

Being able to explain why you do things is essential in real communication. Whether you are writing an email, having a conversation, or giving a presentation, expressing purpose helps your listener or reader understand your intentions.

Without purpose expressions, your sentences can sound short and disconnected. Compare these two sentences:

• Without purpose: ‘I studied. I passed the exam.’
• With purpose: ‘I studied hard so that I could pass the exam.’

The second sentence is clearer, more natural, and more engaging. It shows logical thinking and good language control.

Comparison With Other Languages

Expressing purpose is a universal concept, but the structures are different in each language. Here is a quick comparison between English, French, and Spanish.

One important difference: in French and Spanish, when the subjects are different, you need a subjunctive mood. In English, you simply use ‘so that’ followed by a modal verb like ‘can’ or ‘could’. This makes English a little simpler in this area!

A Complete Example

Let us look at a short paragraph that uses different purpose structures naturally:

‘Maria decided to take an online English course in order to improve her job opportunities. She studied every evening so as not to fall behind. Her company offered her a promotion so that she could work with international clients. She worked very hard to reach her goal, and she succeeded.’

This paragraph uses four different purpose structures. Each one fits naturally in its context. Notice how the text flows clearly and logically.

Key Points to Remember

• Use ‘to’ + infinitive for simple, everyday purposes (same subject).
• Use ‘in order to’ or ‘so as to’ for more formal or emphatic contexts.
• Use ‘so that’ when the subjects of the two verbs are different, or with modal verbs.
• In negative forms, use ‘in order not to’ or ‘so as not to’.
• Expressing purpose makes your English more natural, logical, and clear.

Start practising with simple sentences and gradually try the more complex structures. With a little practice, they will feel very natural!

Sources

• Swan, M. (2005). Practical English Usage (3rd ed.). Oxford University Press.
• Murphy, R. (2019). English Grammar in Use (5th ed.). Cambridge University Press.
• Leech, G., & Svartvik, J. (2002). A Communicative Grammar of English (3rd ed.). Longman.