1) People know that taking tests is hard, but you will get better grades by studying. 2) I learned this lesson when my friend and me studied all afternoon, then aced our final exam for biology. 3) I suggest that if people want to do well, he should try studying, too. 4) In my opinion, scoring well on it is all about how you prepare.

Decide what revision should be made in each sentence to correct the pronoun errors.

Sentence 1:

Sentence 2:

Sentence 3:

Sentence 4: