【知识小结】

①引导目的状语从句，从句中通常用can,could,may,might等情态动词。意为"为了"。

②引导结果状语从句。从句之前常常有逗号，一般从句中无情态动词。意为"因此；结果"。

【相关链接】

in order that..."目的是"，也引导目的状语从句。

so as to"以便于；为了"，只能用于句中。

in order to"以便；为了",可放于句首或句中。

so...that"如此 ......以至于......"。

活学巧用

3.单项填空

（1）The company has a free long-distance telephone number _________ customers may call if they have any questions about its products.

A.so that B.although

C.as D.even if

答案：A

（2）John shut everybody out of the kitchen _________ he could prepare his grand surprise for the party.

A.which B.when

C.so that D.as if

答案：C

（3）We kept milk in a refrigerator _________ it will not spoil.

A.in order B.in case

C.so that D.lest

答案：C

（4）Mary is _________ clever _________she understands everything.

A.such a;that B.such an;that

C.so;that D.so;as

答案：C

4.It+is/was+adj.+that...

【典型例句】

It's likely that it is going to rain tomorrow.

明天可能下雨。

It's obvious that he is a foreigner.

很明显他是一位外国人。

It's strange that Tom should cheat in the exam.

汤姆竟然在考试中作弊，真奇怪。

It's necessary that we should take a taxi to get there on time.

为了能按时到达那儿，我们必须坐出租车。

【相关链接】

在此句型中，it为形式主语，真正的主语是that从句。也可以用不定式作真正的主语构成：It+is/was+adj. for/of sb. to do sth.。如：