94 情態(tài)動(dòng)詞表示推測　Track 094

（1）對(duì)現(xiàn)在的肯定推測
我們以Why isn’t John in class?（約翰為什么沒上課?）為例，來看must，may，could，might，can在表示對(duì)現(xiàn)在情況的肯定推測時(shí)的用法區(qū)別。

 
例句
a. You’ve been traveling all day. You must be tired.
b. Carol must get very bored in her job. She does the same thing every day.
c. I have one teacher who is so forgetful that he gave the same test three weeks in a row. If he does that two more times, I may pass it.
d. Michael: Teacher, is there life after death?
Teacher: Why do you ask?
Michael: I may need the extra time to finish all this homework you gave us.
（2）對(duì)現(xiàn)在的否定推測
我們以The restaurant is always empty.（這家餐館人總是很少。）為例，來看“情態(tài)動(dòng)詞表示對(duì)現(xiàn)在情況的否定推測”的用法。

 

 

注意：must表示推測時(shí)，一般不用在否定句中。在肯定句中，could，may，might三者差別不大。但在否定句中，couldn’t比may not和might not語氣強(qiáng)烈得多。
例句
Judge: How could you swindle people who trusted in you?
Prisoner: But Judge, people who don’t trust you cannot be swindled.
法官：你怎么能夠詐騙信任你的人呢？
罪犯：但是法官大人，不信任你的人是不可能被你騙的。
（3）對(duì)過去的肯定推測：must/can/may/could/might + 完成式
下面我們以Why wasn’t John in class yesterday?（約翰昨天怎么沒上課？） 為例，來看“情態(tài)動(dòng)詞表示對(duì)過去情況的肯定推測” 的用法。

下面我們?nèi)砸訵hy wasn’t John in class yesterday?（約翰昨天怎么沒上課？） 為例，來看“情態(tài)動(dòng)詞表示對(duì)過去情況的否定推測” 的用法。

 
（5）對(duì)將來的推測
下面我們以Tomorrow John will take a test. （約翰明天要考試。）為例，來看“情態(tài)動(dòng)詞表示對(duì)將來情況的推測” 的用法。