Infinitive of purpose

Do you know how and when to use an infinitive to talk about purpose?

Look at these examples to see how we use infinitives of purpose.

• He went to the shops to buy some shoes.

• I'm writing to ask for your help.

• My father runs every day to keep healthy.

Explanation

We use infinitives of purpose to explain why we're doing something.

The use of the "to" infinitive form of a verb in answer to the implied question "why?".

When we want to answer the question why?, we can use an infinitive of purpose. Most of the time, we use the to-infinitive.

• Why do you take the English Grammar course?
  To improve my grammar.

• Why do we always eat at home?
  We eat at home to save money.

• Why do you have a bicycle?
  I use it to go to work.

• Why does she run every morning?
  She runs to keep fit.