河北省唐山市迁西县新集中学初中英语 情态动词：modal verbs课件.ppt

1. Can The parrot can speak three languages. Can I borrow the book from the library. Shanghai can be very cold in March. Could 过去式;语气更委婉,用于疑问句中, 简略回答只能用 can ’t Eg:--- Could I use your bike? --- Yes, you can. 2. Can 和 could 表推测时,一般用于否定句或疑问句,: 1 3. can./could + have + 、疑问句中表示“对过去发生行为的可能性猜测。 2. 在肯定句中表示“本来可以做而未做” 1).The door was lacked. She couldn ’ t have been at home. 2).You could have been more careful. It so late. Can Tom be reading? 这么晚了汤姆还在看书吗? It can ’ t be Mary. She has fallen ill. 此人不可能是玛丽,她生病了. 2 1. May might 过去式;语气更委婉,用于一般疑问句简略回答时,肯定用 may, 否定用 mustn ’t Eg. 1. She may be still waiting for us. 2. May e in? you have a happy holiday. 3 2. may/might + have + 、肯定句中表示对过去动作的推测“也许是……” 2. might+have+ 表示虚拟,表劝告、责备之意。 Eg. 1. He might have spoken to her yesterday. 2. You might have told me earlier. 4 1 . Must ,但只用于肯定句, mustn ’ t 表示“禁止、不准”其形式为: must + have + 。 Eg. The road is wet. It must have rained last night . 2. Must 对现在的动作或行为进行推测时,后接动词原形或 be+ 现在分词: eg: He must be staying there. 他现在肯定 呆在那里. 5 3). It must have rained last night, _________? 2). It must be nice to take a walk here, __________? 1. must 表示推测时,其反意疑问句应根据动词的实际时态而变化。如: is