分词原句:If we heat water enough,we can change it into vapour.————————————————————————————1.Heating water enough,we canchange it into vapour.2.If we heat it enough,water can be changed int

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分词原句:Ifweheatwaterenough,wecanchangeitintovapour.————————————————————————————1.Heatingwaterenough,we

分词原句:If we heat water enough,we can change it into vapour.————————————————————————————1.Heating water enough,we canchange it into vapour.2.If we heat it enough,water can be changed int
分词
原句:If we heat water enough,we can change it into vapour.
————————————————————————————
1.Heating water enough,we canchange it into vapour.
2.If we heat it enough,water can be changed into vapour.
3.Heated enough,water can be changed into vapour.
为什么第三句开头要用过去分词(理由),能不能和第一句一样用现在分词?
我的意思是第三句Heated enough为什么不能改成being heated enough?
Being heated enough,water can be changed into vapour.为什么?

分词原句:If we heat water enough,we can change it into vapour.————————————————————————————1.Heating water enough,we canchange it into vapour.2.If we heat it enough,water can be changed int
不能.
分词作状语时,其逻辑主语应与句中主语相一致.现在分词作状语时,表示正在进行的或主动的动作.如:Heating water enough,we can change it into vapour.heating的逻辑主语是we,这是主动动作.过去分词作状语表示被动或完成的动作,比如第三句和heated的逻辑主语是water、是被动关系.
being done是现在分词的一般被动式、常用来作原因状语或表示正在进行的被动动作,而水被加热变成水蒸汽是一般的情况,用过去分词表被动就可以了.

第一句的主语是人(WE),用现在分词表示主动的。
第三句的主语是物(WATER),故要用过去分词表示被动的。

分词从句看的重点是主从句主语是否一致。
如果不是独立分词从句,那么主从句主语必须一致。
逐句分析:
1.Heating water enough,we canchange it into vapour.
主句主语是we,所以从句主语也必须是we才行,接下来就要看we和动词heat之间是什么关系了,很明显是主动关系,所以就用现在分词形式heating。
2.I...

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分词从句看的重点是主从句主语是否一致。
如果不是独立分词从句,那么主从句主语必须一致。
逐句分析:
1.Heating water enough,we canchange it into vapour.
主句主语是we,所以从句主语也必须是we才行,接下来就要看we和动词heat之间是什么关系了,很明显是主动关系,所以就用现在分词形式heating。
2.If we heat it enough,water can be changed into vapour.
这一句是普通if从句,比较好理解。
3.Heated enough,water can be changed into vapour.
同第一句分析。主句主语是water,所以从句主语也应是water,那么water和heat之间明显是被动关系,所以就用过去分词形式heated。
能理解不,我觉得挺详细了。那个。。急需用分,希望楼主能够采纳~

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第三句的逻辑主语是water,水和加热之间是被动关系,因此只能用过去分词
第一句的逻辑主语是we,我们加热水,是主动关系,所以是现在分词
这是考察非谓语的知识,很重要

因为第三句的主语是water,所以必须是过去分词,其表示的是被动的意思,而第一句的主语是WE,所以用现在分词啊。第三句你可以理解为if water is heated enough,it can be changed into vapour。
希望你能理解,能满足你

第三句,主语是水。。。所以做定语的话,水要被人加热。。。所以用被动。。
前面第一句,人做主语。。所以用主动。。。
第二局,分成两个从句,所以没有问题。。。两句主语各不相同。。。

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