Exercise 21
1 Yes, I am / we are. No, I’m not / we aren’t.
2 Yes, they are. No, they aren’t.
3 Yes, she has. No, she hasn’t.
4 Yes, I do / we do. No, I don’t / we don’t.
5 Yes, he can. No, he can’t.
6 Yes, they had. No, they hadn’t.
7 Yes, she is. No, she isn’t.
8 Yes, I did / we did. No, I didn’t. / we didn’t.