Unit 81: PURPOSE & USE
Here are some ways to show why you did something, why something exists, or what its use is.
to + BASE VERB
We put on lots of clothes to keep warm.
You have to study hard to be a doctor.
NOTICE: We also use in order to the same way.
so that CLAUSE
We put on lots of clothes so that we wouldn't get cold.
I put it by the door so that I wouldn't forget it.
I took a taxi so that I'd arrive early.
because CLAUSE with want
I put it by the door because I didn't want to forget it.
I took a taxi because I wanted to arrive early.
NOTICE: We can give the purpose at the beginning of the sentence if we want to.
To be a doctor, you have to study hard.
Because I wanted to arrive early, I took a taxi.
The seats by the door are for the use of old people.
A pen is for writing with.
What did you do that for?
A barometer is a thing for measuring air pressure.
NOTICE: If there is a verb after for, it is the -ing form.