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10.10 WHAT and WHATEVER

WHAT (the thing(s) that/which)

What stands for the thing(s) that/which: 

I didn't understand what he was saying. (the things that he was saying)
Is this what you want? (the thing that you want)

What is different from the other relative pronouns in that it does not refer back to a noun:

I wrote my essay on a photo which was taken by Robert Capa. (which refers to a photo)
That's not what we agreed on. (what does not refer to a noun)

For this reason, what can't be used instead of who, whom, whose, which or that in relative clauses:

I wrote my essay on a photo what which was taken by Robert Capa.

When in doubt, replace what with the thing(s) that/which and see if the sentence is still grammatically correct.

WHATEVER, WHOEVER, WHICHEVER, WHEREVER, WHENEVER

whatever » anything that
whoever
» anyone who
whichever
» any ... which
wherever
» at any place
whenever
» at any time
You can do whatever you want to.
Whoever leaves last should turn off the lights.
Choose whichever pencil you like.
Wherever I looked there was something interesting to see.
Whenever I go abroad, I take as many pictures as possible.

It is possible to use what instead of whatever in the first sentence above, but it is not possible to use who instead of whoever in the second sentence:

You can do what you want to.
Who leaves last should turn off the lights.