👧Look at that man. He's running fast. He must be late.看那个男人。他跑得很快。他一定是迟到了。
👦Or he might be a thief!或者他可能是小偷！
👧She's wearing a white coat. She must be a doctor.她穿着白大褂。她一定是医生。
👦She can't be a doctor. She's too young. She may be a nurse.她不可能是医生。她太年轻了。她可能是护士。
👧He's been working all day. He must be tired.他工作了一整天。他一定很累了。
👦Yes, he can't be feeling well.是的，他不可能感觉很好。
👧Is he a mechanic?他是机械师吗？
👦He might be. Or he could be an engineer.他也许是。或者他可能是工程师。
👧They must be worried about the exam.他们一定在担心考试。
👦They can't be worried. They're smiling!他们不可能在担心。他们在笑呢！