五险是哪五险当主句的主语和从句的主语一致时且 谓语动词为be，常省略从句的主语和be动词.
省略的条件: (1)从句中被省略的主语必须与主句的主语一致,或者是it；(2)谓语动词必须含有be；(3)从句必须与主语和be动词一起省去，不可只省略主语而保留整个谓语，也不可只保留主语而省略谓语。
例：Please come here as soon as（it is）possible.
While （I was——walking in the rain, I heard my name called. 我在雨中漫步时，听到有人叫我的名字。
2. 由if/unless引导的条件状语从句例：She won’t come to party unless（she is）invited.
3. 由though/although/even if/even though引导的让步状语从句 华晨宇家世
例：He is very good at painting, though（he is）very young. T
hough（he was）exhausted, he stayed up late. 尽管疲惫不堪，他仍很晚才睡。
4. 由because引导的原因状语从句
例：He was praised because （he was）brave.
5. 由wherever/where引导的地点状语从句
例：Fill in the blanks with articles where（it is）necessary.
6. 从句和主句中相同或大体相同部分都可以省略
例：The sooner, the better. 越早越好。舞者
She is as tall as I. 她和我一样高。
7. 由as if/as though/as 引导的方式状语从句
例：The boy looked as if（he was）afraid of nothing.
如何提高市场占有率I wonder why he didn’t do as（he was）told to.
1升是几斤8. 比较状语从句 省略相同的部分 ：
例：She likes reading better than (she likes) going to parties.
农村十大暴利行业He has lived here longer than I (has lived).
In winter it is colder in Beijing than（it is）in Guangzhou.
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