36. If he spoke clearly, people would understand him.
(Câu điều kiện, diễn tả điều không có thực ở hiện tại => If clause loại 2)
37. She hasn't gone out with him for 2 years. (The last time + past simple -> Phủ định của Present perfect tense)
38. He used to go swimming when he was a boy.
39. The test was too hard/difficult for her to do.
40. He asked me if I was writing to my pen pal then. (Reported speech, lùi thì, chia lại ngôi với đổi từ chỉ thời gian)