Customer：When I bought this cat，you told me he was good for mice. He doesn’t go near them！

Assistant：Well，isn’t that good for mice？

*注：be good for ①對……有作用 ②對……有好處

Stephen：We have got a new dog. Would you like to come round and play with him？Paul：Well，I don’t know. Does he bite？Stephen：That’s what I want to find out.