With demonstratives (this, that, these, those) we can say all of or all without of.
All (of) this has to go out into the rubbish bin.
We often use of after all in definite noun phrases (e.g/before the, possessives and demonstratives), but it is not obligatory:
All (of) the workers were given a pay-rise at the end of the year.
I gave all (of) my old books to my sister when she went to university.
What shall we do with do with all (of) this cardboard? Throw it out?
Note: the word “humanity” seems to break this rule, and both “all humanity” and “all of humanity” are in use:
All of humanity was at risk of being wiped out by the disease.
All humanity was at risk of being wiped out by the disease.
All+the and all of+the
We use all+the/my/etc+noun to refer to particular people or things. Before a noun with a determiner (the, my, this, etc) all and all of are both possible.
All the lights were out. (plural count noun)
All of the lights were out. (plural count noun)
I have invited all my friends to my birthday party (plural count noun)
I have invited all of my friends to my to my birthday party (plural count noun)
I used all of the paper in my notebook to write my essay (non-count noun)
I used all the paper in my notebook to write my essay (non-count noun)
ALL OF THE+Ns (plural noun): use this pattern when you want to talk about specific nouns.
ALL THE+ Ns (plural noun): explain to students that this pattern is the causal form of the “all of the+Ns” pattern, where “of” is simply dropped to shorten the phrase.
All with nouns and pronouns.
All can modify nouns and pronouns. We normally place it before the noun/pronoun. When all refers to a personal pronoun which is the object in a clause, we can use pronoun+all or all of+pronoun. The pronoun is in the object form:
I have invited all (of) my friends.
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