- [clause + before + clause
before + clause, + clause]
We can either say: A happened before B happened
- OR Before B happened, A happened.
The meaning is the same: A happened first.
Note the comma (,) in the second structure.
- I bought a lot of new clothes before I went to America.
Before! went to America, I bought a lot of new clothes.
He did military service before he went to university.
( = He did military service first.)
Before he did military service, he went to university.
( = He went to university first.)
- I ‘ll telephone you before you leave.(NOT before you will leave.)
- Please put out all lights before leaving the office.
Before beginning the book, he spent five years on research.