示例:
Liang liang: Hello, Mum.
Mum: Hi, Liangliang. Are you hungry? Come and have a cake.
Liang liang: No, thanks, Mum.
Mum:What's the matter? Are you ill?
Liangliang: No, but I'm tired and thirsty. I have a basketball match at school today.
Mum: Have a rest on the sofa. Here's some water. Liangliang: Thank you, Mum.
