Relative clauses. Clauses with who/that/which. Part 2
You must use who/that/which when you refer to the subject of the relative clause.
Sometimes who/that/which is the object.
Have you found the keys that you lost?

1. When who/that/which is the object, you can drop it.

The woman I wanted to see was away.

The dress Kate bought doesn’t fit her very well.
2. Note the position of prepositions (in/to/for) in relative clauses:

Are these the books you were looking for?

The woman he fell in love with left him after a month.
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3. You cannot use what in the following sentences:

Everything (that) they said was true.

I gave her all the money (that) I had.

What = ‘the thing(s) that’.

Did you hear what he said? (= the things that he said)