What's the difference between these two sentences?
- He ate all his food
- He ate all of his food
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According to The Free Dictionary: If you want to say something about the whole of a thing, you use all or all of, followed by the, this, that, or a possessive determiner, followed by an uncountable noun or the singular form of a countable noun.
So Kshitij Singh's answer is correct. The use of "of" is optional, and we normally drop it in such a sentence.