2. Something terrible must have happened if Maochang was not coming to eat with his as he always did. 要是李昌不像往常那样到他店里吃饭,那问题一定严重了。

[解释] 情态动词 + have done

1). 情态动词must +have done只用于肯定句中,表示对过去发生的事情或状态进行肯定的推测,意为“过去一定做过某事”。

It must have rained last night, for the road is wet. 昨天晚上一定是下雨了,因为路还湿着。  

You must have seen the film the Gold Rush. 你肯定看过电影《淘金热》。

2). 情态动词can/could可用于否定句中,即can’ t have done /couldn’ t have done,表示对过去发生的事情或状态的肯定的推测,意为“过去不可能做过,肯定没做过”。

My sister met him at the theatre last night, so he couldn’ t have attended your lecture. 我姐姐昨天晚上在电影院遇见了他,所以他肯定没参加你的演讲.

3). 此外,can/could have done还可用于疑问句中表示对过去发生的事情或状态的不太有把握的推测,常表示“过去可能做过吗?”(注意:表推测的情态动词只有can/could常用于疑问句中)

I can’ t find Tom anywhere in the office building. Where can he have gone? 我在办公楼任何地方都找不到汤姆。他有可能去了哪里了呢?

4). 情态动词may/might +have done表示对已发生的动作或存在的状态进行不肯定的推测,might语气稍弱一点儿,只能用于肯定句和否定句中,表示“过去可能做过某事

或过去可能没做过某事”。

You might have read about it in the papers. 你可能在报上已经看过这个消息了。

[练习] 用括号中所给词的适当形式填空。

1).  一Where _______ Margaret _______ the empty bottles (can; put)?

一She _______ them away. They must be somewhere (can; throw).  

2).  一_______he _______ as captain of the football team (can; choose)?

 一Yes, he must have.  

3).  一Hurry up, Michael! It’ s ten to three.  

-Goodness me! The class ______ (must; begin). I’ ll be late again.  

Keys: 1). can; have put   2). can’ t/ couldn’ t have thrown   3). must have begun

7. in debt 欠债                         

[典例]

1). They are in heavy debt to the Bank of China. 他们欠中国银行很多钱。

2). You saved my life: I am forever in your debt. 你救了我的命: 我永远感恩不尽。            

[短语归纳] debt短语和 “in + n.” 表示“在……(情况、状况、状态)中”:

get/run into debt 欠债;负责           out of debt不欠债            run up huge debts高筑债台        

pay off one’ s debts还清债务           in danger 在危险中           in trouble陷入困境,倒霉

in order 井井有条                   in surprise 吃惊              in public 当众,公开        

in ruins 呈废墟状态                 in sight 看见                in silence沉默着

[练习] 根据句子意思用debt短语和 “in + n.” 结构填空。

1). He ______ ______ ______ after he was out of work.

2). He did all he could to ______ ______ ______ ______ in five years.

3). He was ______ ______ when he was young, but has been ______ ______ ______ since he got rich.

4). James was ______ _______, but I don’t know how to help him out.

5). After the war, the whole city was _______ _______.

Keys: 1). ran/got into debt  2). pay off his debts  3). in debt; out of debt   4). in trouble      5). in ruins

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