dialogue: M: Hi, you're new here, aren't you? What's your name? W: Sally. M: Want to come and play? W: I'd like to, but I can't, My mum sys I've got to stay and help her. It's my brother's birthday and we're having a party, too. M: Oh, you've got a brother, have you? W: Yes, not very far away. Cathy, my sister-in-law, works in the bookshop over there. They've got a new baby called Liz. I mean Elizabeth really, and we call her Liz. M: Is that your mum over there calling you? W: No, that's my Aunt May, my mum's twin sister. I'd better go. Bye. M: Bye.
question: Why can't Sally play?
choice: Because she doesn't like to. Because she has to help her mother. Because she is having a party.
answer: Because she has to help her mother.