情态动词
情态动词也是一类特殊的动词，平时我们不把它说成是动词。情态动词可以和行为动词同时出现在同一个句子中。
我们现在学过的情态动词有：can、could、shall、should、will、Would、may、might 、must。 注意：情态动词后动词总是用原形。（不受其他任何条件影响）
其否定形式：can not = can’t, must not = mustn’t, … 注意：may not和shall not（无缩写形式）
练一练：
选择填空。
( ) 1) The sign on the wall means you ______stay away from the building.
A. must B. can’t C. shouldn't
( ) 2) How many books ______ you see on the desk?
A. may B. can C. should
( ) 3) It means you ______ make noise in the library.
A. should B.. shouldn't C. can
( ) 4) --- ______you like a glass of milk? --- Yes, please.
A. May B. Could C. Would
( ) 5) --- ______you see the sign over there? --- Sorry, I can’t.
A. Can B. Can’t C. Should
( ) 6) ______ we go to the park by bus? A. May B. Must C. Shall
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