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止 1. You ___ buy a gift, but you can if you want to. A. must B. mustn’ t C. have to D. don’ t have to 2. When I was young, I was told that I ______ play with fire. A. wouldn39。t B. needn39。t D. daren39。 . Shall we begin our class? Shall he go now? 2. 用于提出 命令、允諾 ,或用于 法律、規(guī)定 . You shall get my book on Sunday. He shall leave the house at once. The sign reads: No person shall smoke here! 用于第一、三人稱 will would 1. 用于向第二人稱,征求對(duì)方意見。 . You can’ t be hungry already — you had lunch only two hours ago! 2. can用于肯定句中表示 理論上的可能性 ,并不牽涉是否真的會(huì)發(fā)生 . You can hurt yourself if you play in the street. may/ might表示推測(cè) 1. can not 不可能 may not 可能不 2. may well “ 極有可能” . Liza may well not want to go on the trip she hates traveling. 3. may/ might as well “ 不妨” . You may as well stay for dinner. 1. That be Ann’ s husband, for I a