二、句型剖析

1.含有助动词do的强调句型

【典型例句】

He does work hard and finish the job in time.

他的确工作努力，并按时完成了工作。

Do come and see us some day.

有一天务必来看我。

I did tell him the truth yesterday.

昨天我确实把事实告诉他了。

【知识小结】

（1）在肯定句的谓语动词之前（通常是现在时和过去时的肯定句），可用助动词do(does,did)来强调动词，这时谓语动词须用原形动词，do(does,did)可译成"确实，的确"。

（2）在肯定的祈使句中，用动词do来加强语气，可译成"务必，一定，千万"。

活学巧用

1.1）单项填空

-You should have returned the book to the library yesterday.

-But I________ .Don't you know?

A.had B.should C.did D.was

提示:句意为："我的告诉了，难道你不知道吗？"

答案:C

2）把下列句子变成强调谓语动词的句子

（1）His company operates in several countries.

__________________________________________

答案：His company does operate in several countries.

(2)I came across an old photograph yesterday.

__________________________________________

答案：I did come across an old photograph yesterday.

2.It is/was+adj.+to do.

【典型例句】

It is not easy to finish the work in two days.

两天内完成这项工作不是很容易。

It is right for you to make this important decision.

对于你来说，作出这个重要决定是正确的。

It is easy to answer this question.

回答这个问题是很容易的。

It is easy to cut up the meat.

把肉剁碎是很容易的。

It is difficult to answer the question correctly.

正确地回答这个问题是很难的。

【知识小结】以上句子的基本结构为It is/was+adj.+to do。特别要注意在这种结构中，即形容词后的不定式要用主动形式表示被动意义。