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be Linda’s schoolbag.mustcan’tcouldmightmustPair workA: Whose football is this?B: Bill’s ?A: It might be Bill’s. Let’s ask him. Bill, is this your football?C: No, it’s not mine.A: Well, it isn’t Bill’s. He says it’s not his.C: Is it Anna’s?A: Let’s ask her. Anna, is this your football?C: No, it isn’t.A: So it’s not Anna’s football. And it can’t be Maria’s. Because I didn’t take hers. Then whose football is it?B: Is it Lee’s?A: Yes, it doesn’t belong to Bill, Anna or Maria. So it must be Lee’s.belong to sb = be sb’s情 態(tài)動(dòng)詞 意思 推 測(cè) 程度must 一定,肯定 100% 的可能性maymight/could有可能,也 許 20%80% 的可能性can’t 不可能,不會(huì) 可能性幾乎 為 零What have you learned today