Before “the” “these” “those” “his” “our” (both can be acceptable; “all” is preferable in formal style)
✅ All the things have been cleared up.
✅ All of the things have been cleared up. (ok, but not necessary, not a must)
Before a “general” noun (factual statements)
✅ All reactions require attention. (a fact)
❌ All of reactions require attention.
Before a personal pronoun (them, us, which)
✅ All of them have been completed.
❌ All them have been completed.
❌ All they have been completed.
✅ All we believe.
(This sentence is correct, but English speakers would interpret this as "everything we believe" and not "everybody believes.") ✅ All they are thinking.
(This sentence is correct, but English speakers would interpret this as "everything they are thinking" and not "they all are thinking.")
Before pronouns
✅ Both of us are ready.
❌ Both us are ready.
After pronouns
✅ They both are ready.
❌ They both of are ready.
To intro two options
✅ Both Option A and Option B are feasible, however, we’re leaning more towards the former one.
❌ Both of Option A and Option B are feasible, however, we’re leaning more towards the former one.
With plural nouns
✅ Both reactions worked well.
✅ Both of the reactions worked well.
❌ Both the reactions worked well.
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