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all, all of

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all

In formal writing, omit the of after all. Remember the folk song:

All My Trials Not:

All of My Trials

all of

In two situations, however, you should include the of.

1. When the word following all is a pronoun.

all of them

But when that pronoun is possessive, omit the of:

She completed all her homework.

2. When the word following all is a possessive noun.

She read all of Grisham’s books.

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"all, all of." Grammar.com. STANDS4 LLC, 2017. Web. 23 Nov. 2017. <http://www.grammar.com/all-all-of>.

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