Possible Duplicate:
“all that” vs. “all what”
How can I be sure when to use 'all that' or 'all what' in making sentences. Is there any differences in their meaning. I've tried googling but the results just didn't match. For instance:
All that the president said was published in the dailies.
or
All what the president said was published in the dailies.
In your examples, the only correct one is the first:
All that the president said was published in the dailies.
What would be correct by itself, as in:
What the president said was published in the dailies.
However, all what is always wrong, and you should use either all that (or everything that, the words that, etc) or what.
That is a relative pronoun like who/whom, whereas what is a nominal relative pronoun. The two words fulfill distinct grammatical parts, and cannot be interchanged.
I think your confusion stems from the fact that that is usually a relative pronoun, but it is not so here. All that the President said would be correct, but only as a longer form of All the President said in which that is used as a conjunction: consider All the stuff that the President said. ?All that stuff that the President said is not ungramnatical, but I doubt whether a native speaker would use it, precisely because of the repetition.
On the other hand, ?All of what the President said could only be used (if at all) as an emphatic form of What the President said, where what really is the relative pronoun.
