连词加非谓语可以看作是一种省略句。
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状语从句的省略，同时具备的两个条件
① 主句和从句的主语一致，或从句主语为it；
② 从句主要动词是be的某种形式。
此时从句中的主语和be动词常可省略。例如：
When ( the museum is ) completed , the museum will be open to the public next year .
He’ll go to the seaside for his holiday if (it is ) possible.
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状语从句的"省略"现象常存在于五种状语从句中
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由if, unless等引导的条件状语从句;
If (it is) possible, he will help you out of the difficulty.
如果可能的话,他会帮你摆脱困境。
You must attend the meeting unless (it is) inconvenient to you.
除非情况对你来说不方便,否则你必须出席这次会议。
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由although, though, even if / though等引导的让步状语从句
I won’t go to the party even if (I am) invited.
即使被邀请我也不会参加这个派对。
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由when, while, as, before, after, until / till等引导的时间状语从句;
While (I was) waiting for him, I found my wallet was missing.
当我正在等他的时候，我发现我的钱包丢了。
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由as, as if等引导的方式状语从句;
The meeting took place as (it was) planned.会议按照计划进行。
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由as, than等引导的比较状语从句。
The movie was more interesting than (it was) expected.
这部电影比预想的更有趣。
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省略后的结构可称为“连词+非谓语形式”，主要有七种类型
同独立主格结构相似（参看P16考点1）
Whenever (she is) free, she often goes shopping.她有空就去逛商店。
Work hard while (you are) young, or you'll regret.少壮不努力,老大徒伤悲。
As (he was) a young boy, he was always ready to help others.
他在孩提时代就乐于助人。
While (she was) walking along the river bank, she was singing a pop song.
她沿着河堤边走边唱着流行歌曲。
Although (he is) doing his best in math these days, he has still got no good marks.
尽管近来他一直在学数学,但他仍然没有取得好成绩。
He won't go there with us unless (he is) invited.
除非受到邀请,否则他不会和我们一道去那里。
The concert was a greater success than (it was) expected.
这场音乐会出乎意料地取得了巨大成功。
He stood up as if (he were) to say something.当时他站起来好像要说什么。
She looked anxious as if (she was) in trouble.
她看上去很焦急,好像遇到了麻烦。
He had mastered the English language before (he was) in the USA.
他到美国之前就懂英语了。
While (you are) upstairs, keep the windows closed.
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【2007四川】 The flowers his friend gave him will die unless ________ every day.
A. watered B. watering B. water D. to water
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The man kept silent in the room unless ______ .
A. spoken to B. spoke to C. spoken D. to speak
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【2010浙江】The experiment shows that proper amounts of exercise, if _______ regularly, can improve our health.
A. being carried out B. carrying out
C. carried out D. to carry out
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【2007 全国I】We all know that, __________, the situation will get worse.
A. not if dealt carefully with
B. if not carefully dealt with
C. if dealt not carefully with
D. not if carefully dealt with
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【2008安徽】-----Have you got any particular plans for the coming holiday?
----- Yes, _____, I’m going to visit some homes for the old in the city.
A. If ever B. If busy C. If anything D. If possible
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