74.3 Complete the sentences with this is or that's or that.
1 a: I'm sorry I'm late. That's all right.
2 A: I can't come to the party tomorrow. b: Oh, that's a pity. Why not?
3 on the phone
sue: Hello, Jane. That's Sue.
Jane: Oh, hi Sue. How are you?
4 a: You're lazy.
B: That's not true!
5 A: Beth plays the piano very well.
B: Does she? I didn't know that.
6 Mark meets Paul's sister, Helen.
PAUL: Mark, that's my sister, Helen.
Mark: Hi, Helen.
7 A: I'm sorry I was angry yesterday.
B: That's OK. Forget it!
8 a: You're a friend of Tim's, aren't you?
b: Yes, that's right.