四级语法情态动词思维导图
英语四级语法情态动词你了解吗
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四级语法情态动词思维导图模板大纲
一、对比can与beableto
1、若表示在过去 成功地做了某件事时，只能用was/were ableto,不能用could
例句:The patient was able to get over his illness= The patient managed to get over his illness
2、比较肯 定得否定推测用can't,不用mustn't
例句:If the chef didn't give him the secret recipe, he can't do the dish
1、提出委婉得请求 (答句中通常用can)
例句:一Could I have a temporary break? 一Yes, you can、/ No, you can't
2、在否 定句中表示推测，意为“不可能”
例句:He couldn't perpetrate such a brutal crime since he is always as cowardly as a mouse
二、对比may与might
might在表示推测时，可能性比may小，且不表示时态
注:固定搭配词组: may/might as well do sth “不妨”
注: could 与might在表示推测得时候，推测得程度不如can与may，且都不表示时态
三、must 表示推测
1、当must表示对现在正在发生得事情推测时,must后跟动词得进行时
例句:The student must be studying in his room now since the final examis approaching
2、当must表示对已经发生得事情推测时，must 后跟动词得完成时
例句:He must have gone to work since he wasn't at home
3、当must表示对过去某时正在发生得事情进行推测时，后接动词得完成进行时
例句:The old man must have been talking with another lady, so he didn't answer the phone in time
四、had better“最好做某事”
had better have done sth意为“本来最好做某事”，表示与事实相反得结果
后跟动词原形，即had better do sth
例句：You had better have seen her off at the airport
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