【点拨】as though= as if 好像，似乎。可以引导方式状语从句或表语从句。从句的语气可以用陈述语气，也可以用虚拟语气。如：It looks as if we will be late.看起来我们好像会迟到。She always talks to me as if she were my sister. 她总是以我妹妹的语气和我说话。

【点击高考】)When a pencil is partly in a glass of water, it looks as if it _________.(NMET 1995)

A. breaks B. has broken C. were broken D. had been broken

【解析】答案是C。as if 在句中引导一个表语从句，表示与现在事实相反的虚拟语气，从句用一般过去时。

【思维拓展】形似词组：even if / even though 即使，尽管。例如：We have decided to visit the school even though it rains tomorrow.

【巩固练习】(1) We won’t give up we should fail ten times.

A. even if B. since C. whether D. until

(2) he was badly ill, she was always looking after him willingly.

A. Even B. As if C. Even though D. However

答案：(1) A (2) C

3. 状语从句中的省略

【点拨】含有when, while ,until, if, unless, once, before等引导的状语从句的主从复合句中，若从句的主语和主句的主语一致，并且从句中谓语动词有be的某种形式，从句中的主语及部分谓语(be动词)可以省略。例如：Be careful when crossing the street. Some students like studying while listening to the tape.

【点击高考】When________ , the museum will be open to the public next year.(2002上海)

A. completed B. completing C. being completed D. to be completed

【解析】答案是A。这是一个省略句，从句省略了the museum is。原句是：When the museum is completed, the museum will…。

【巩固练习】用括号里所给的动词的适当形式填空：

(1) When __________ (work) with the workers, we learned a lot from them.

(2) When ___________ (ask) , he always gives good advice.

(3) He will not go the party unless __________.(invite)

(4) The research can not be stopped once____________. (begin)

答案：(1)working (2)asked (3) invited (4) began

4. 代/名+介词+which引导的定语从句

【点拨】这样的定语从句一般是非限制性定语从句，which在从句中作介词的宾语，代指前面的物或事。例如：They all come from the USA, most of whom are scientists.他们都来自美国，大部分是科学家。We had a meeting, the purpose of which was completely unclear. 我们开了一个会，会议的内容还不完全清楚。

【点击高考】Recently I bought an ancient Chinese vase, __________ was very reasonable.(2002上海)

A. which price B. the price of which C. its price D. the price of whose

【解析】答案是B。这是一个非限制性定语从句，the price of which指代花瓶的价格，等于whose price。

【巩固练习】(1)There are two buildings, ________ stands nearly a hundred feet high.(2004 湖北)

A. the larger B. the larger of them C. the larger are that D. the larger of which

(2)The factory produces half a million pairs of shoes every year, 80%_______ are sold abroad.(2004辽宁)

A. of which B. which of C. of them D. of that

答案：(1) D (2) A

5. –ing作状语

【点拨】动词的-ing形式作状语时，应该注意以下三个方面：(1)分词表示的是句子主语发出的动作;(2)分词表示的动作和谓语表示的动作或状态是同时发生或先后发生;(3)分词表示的是次要的动作，一般是对谓语表示的动作或状态加以说明。常用来表示伴随、原因、时间和结果等。例如：He often sits on the sofa, watching TV. (伴随)The bell which indicated the end of the class rang, interrupting our heated discussion. (结果)

【巩固练习】用括号里所给动词的适当形式填空

(1) _________ so poor in those days, they couldn’t afford to send their son to school.(be)

(2) _______ out of the room, he found the boy still there.(walk)

(3) His wife died in 1990, _________ him two children.(leave)

(4) They stood there for an hour, __________ the game.(watch)

答案：(1) Being (2) Walking (3) leaving (4) watching

词语辨析

1. sometimes, sometime, some time 和some times 四个词的区别。

sometime 是副词，意思是：在某时。表示不确定的时间，可以与将来时也可以与过去时连用;sometimes是频度副词，意思是：偶尔，有时。常与一般现在时或一般过去时连用;

some time是名词词组，意思是：一段时间。常指将来;some times是名词词组，意思是：几次，几倍。

【例句】I usually go to school on foot, but sometimes I go to school by bike.

I saw him sometime last winter.

She will stay in Beijing for some time.

I met him some times in the street last week.

2. if only与only if的区别