20.3
3 I didn't play tennis yesterday afternoon.
4 What time did you go to bed last night?
5 Have you ever met a famous person?
6 The weather wasn't very good yesterday.
7 My hair is wet. I have just washed it.
8 I have washed my hair before breakfast this morning.
9 Kathy travels a lot. He has visited many countries.
10 Is Sonia here? No, she hasn't come yet.
20.4
1 A: Did you have a good time?
B: Yes, it was great.
2 A: where is Alan? Have you seen him?
B: Yes, he went out a few minutes ago.
A: And Julia?
B: I don't know. I haven't seen her.
3 A: Rose works in a factory. She has worked there for six months . Before that she was a waitress in a restaurant . She has worked there for two years, but she didn't enjoy it very much.
4 A: Do you know Martin 's sister?
B: I saw her a few times, but I have never spoken to her. Have you ever spoken to her?
A: yes, I met her at a party last week. She's very nice.