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For this sentence "I know about what we need."

I don't understand why we use "what" we need.

What is the function of "what" ?

Is it a pronoun?

Can we use "that" instead of "what"?

Could you please explain it to me?

And could you give me some examples about using clause after preposition?

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Yes, it's pronoun.

No, you can't use that, not in a word-for-word exchange, although one could say:

"I know about that which we need."

That sounds a bit stilted, though, in my opinion. I think you'd be better off saying:

"I know what we need."

(There's no need for about in that sentence).

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  • How about 'I know that thing we need'? Oct 30 '13 at 9:53
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    @VijayaRagavan - I would say, "I know the thing we need..." (using the instead of that).
    – J.R.
    Oct 30 '13 at 9:55

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