We use certain clauses to show why somebody does something. These are called purpose clauses. They are introduced with the following words or expressions:
- to + infinitive
- He watched the news to be informed about what was going on
- In order to/So as to + infinitive (formal)
- She went to the library in order to borrow a book.
- They saved some money so as to buy a new car.
In the negative form, we can use both structures, however, we cannot use not to + infinitive.
- I didn’t ring you not to wake you up.
- I didn’t ring you in order not to / so as not to wake you up.
- so that + can/will – used for a present or future reference.
- Here’s my number so that you can phone me if you have a problem.
- so that +could/would – used for a past reference.
- We left early so that we would be able to park close to the theatre.
- for + noun – used to express purpose.
- We went out for a pizza.
- for + -ing – used to express purpose and/or function of something.
- This function on the air conditioner is for reducing humidity.
7. with a view to + ing, with the intention of, with the aim to / of + ing
- I came to this school with the view to getting a degree.
- I approached them with the intention of helping them.
- I conducted a survey with the aim of knowing people’s opinión.
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