情态動詞
情态動詞也是一類特殊的動詞，平時我們不把它說成是動詞。情态動詞可以和行為動詞同時出現在同一個句子中。
我們現在學過的情态動詞有：can、could、shall、should、will、Would、may、might 、must。 注意：情态動詞後動詞總是用原形。（不受其他任何條件影響）
其否定形式：can not = can’t, must not = mustn’t, … 注意：may not和shall not（無縮寫形式）
練一練：
選擇填空。
( ) 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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