1. Much, more, less (some nouns occur only in the singular form)
Incorrect: There is much dusts. There is more courages. He had less funs.
Correct: There is much dust. There is more courage. He had less fun.
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2. Less, fewer (countable nouns);
Incorrect: There were less people.
Correct: There were fewer people.
3.Possession shared by two nouns!
Incorrect: It was John’s and Peter’s car.
Correct: It was John and Peter’s car.
4.His/hers/its (If you don’t know an animal’s gender, you use “it”.)
Incorrect: The dog lost his bone. (You don’t know the gender.)
Correct: The dog lost its bone.
5.That/who
Incorrect: I have written to my sister that lives in France.
Correct: I have written to my sister who lives in France.
6.Me/I
Incorrect: Give it to I. Jason and me took the class. He read as well as me.
Correct: Give it to me. Jason and I took the class. He read as well as.
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