Englishfor English speakers
what
Pronoun
—
What is used to ask for information about things.
What did you see?
What do you mean?
—
What is used to add a clause with more information.
I don't know what you mean.
I'll tell you what to do.
I'll see what I can do to help.
—
What is used when you want to describe something instead of naming it.
Take what you can find.
Can I see what you did?
I could change it if that's what you want.
what
Determinative
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What is used to ask about the member(s) of a group.
What book did you buy?
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What is used to add a clause to identify the member(s) of a group.
I don't know what problems you mean.
I'll tell you what button to push.
I'll see what food I can give.
what
Adjective
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used to show that you feel strongly about something.
What a great book this is!
for
Preposition
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shows that something belongs to something else, or has a specific function
This cake is for you.
This is a net for catching fish.
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For is used to show the reason for something
He was angry, for he had never been called such terrible names before.
for
Subordinator
—
For introduces a clause with a subject and a to-infinitive
It's not good for you to be too relaxed.