初中英语情态动词学习技巧（初中英语高分语法大全）
初中英语情态动词学习技巧（初中英语高分语法大全）Can he be in the office now? No he can’t be there for I saw him in the library just now.(语气很强，常用于疑问句和否定句中)We could have walked there; it was so near.（推测某事本来可能发生，但实际上没有发生）He may not be at home. / They might have finished their task. 3. can和could“可能”，could表示可疑的可能性，不及can’t语气强，用于肯定、否定、疑问句中。The weather in that city could be cold now.
初中英语高分语法大全—情态动词（基本用法，表示推测）
以must为例。must do(be)是推测现在存在的一般状态进行；must be doing 推测可能正在进行的事情；must have done是推测可能已经发生过的事情。
1. must“肯定，一定”语气强，只用于肯定句中。
He must be a man from America. / He must be talking with his friend. / He must have already arrived there.
2. may和might“也许”，后者语气弱，更没有把握。可用于肯定句和否定句。
He may not be at home. / They might have finished their task.
3. can和could“可能”，could表示可疑的可能性，不及can’t语气强，用于肯定、否定、疑问句中。
The weather in that city could be cold now.
We could have walked there; it was so near.（推测某事本来可能发生，但实际上没有发生）
Can he be in the office now? No he can’t be there for I saw him in the library just now.(语气很强，常用于疑问句和否定句中)
三、情态动词注意点：
1. can和be able to: 都可以表示能力。但be able to可以表达“某事终于成功”，而can无法表达此意。Be able to有更多的时态。另外，两者不能重叠使用。
2. used to和would:
used to表示过去常常做现在已经不再有的习惯，而would只表示过去的习惯或喜好，不涉及现在。
3. need和dare作情态动词和实义动词的区别：
两者作情态动词时常用于否定句和疑问句。其形式为：needn’t/daren’t do；Need/dare…do…?
做实义动词时可用于肯定句，否定句和疑问句。其形式为：need(needs/needed)/dare(dares/dared) to do don’t(doesn’t/didn’t) need/dare to do
