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主语从句知识汇总,高一英语主语从句知识汇总

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  高一英语主语从句知识汇总

  1.定义:用作主语的从句叫做主语从句。

  2.构成:关联词+简单句

  3.引导主语从句的关联词有三类:

  (1)从属连词that。如:That they were in truth sisters was clear from the facial resemblance between them.

  很明显,她们确是亲姐妹,她们的脸型很相似。

  (2)从属连词whether。如:

  Whether he’ll come here isn’t clear.他是否会来这里还不清楚。

  (3)连接代词who,whom,whose,what,which,whoever,whatever,whichever

  连接副词where,when,how,why。如:

  What she did is not yet known.她干了什么尚不清楚。

  How this happened is not clear to anyone.这事怎样发生的,谁也不清楚。

  Whoever comes is welcome.不论谁来都欢迎。

  Wherever you are is my home----my only home.你所在的任何地方就是我的家----我唯一的家。

  解释:

  1.主语从句能用it作形式上的主语。常以it作形式主语的句型有:

  A.It+be+形容词(obvious,true,natural,surprising,good,wonderful,funny,possible,likely,certain,probable,etc.)+that从句。如:

  It is certain that she will do well in her exam.毫无疑问她考试成绩会很好。

  It is probable that he told her everything.很可能他把一切都告诉她了。

  B.It+be+名词词组(no wonder,an honour,a good thing,a pity,no surprise,etc.)+that从句。如:

  It’s a pity that we can’t go.很遗憾我们不能去。

  It’s no surprise that our team should have won the game.我们没赢这场比赛真意外。

  C.It+be+过去分词(said,reported,thought,expected,decided,announced,arranged,etc.)+that从句。如:

  It is said that Mr.Green has arrived in Beijing.据说格林先生已经到了北京。

  It is reported that China has sent another man-made earth satellite into orbit.

  据报道中国又成功地发射了一颗人造地球卫星。

  D.It+seem,happen等不及物动词及短语+that从句。如:

  It seems that Alice is not coming to the party at all.Alice似乎不来参加晚会。

  It happened that I was out that day.碰巧我那天外出了。

  E.It+doesn’t matter(makes no difference,etc.)+连接代词或连接副词引起的主语从句。如:

  It doesn’t matter whether she will come or not.她是否来这无关紧要。

  It makes no difference where we shall have the meeting.我们在哪里开会毫无区别。

  F.当that引导的主语从句出现在疑问句中时,要以it作形式主语,而把主语从句后置。如:

  Is it true that the scientist will give us a lecture next week?下周那位科学家将给我们作报告是真的吗?

  Does it matter much that they will not come tomorrow?他们明天不来很要紧吗?

  G.当主语从句出现在感叹句中时,要以it作形式主语,而把主语从句后置。如:

  How strange it is that the children are so quiet!孩子们这么安静真奇怪!

  2.注意连接代词whoever,whatever,whichever等引导主语从句的含义

  Whoever comes will be welcome.(whoever=the person who)来的人将受到欢迎。

  Whatever he did was right.(whatever=the thing that)他所做的事情是正确的。

  Whichever of you comes in will receive a prize.(whichever=anyone of you who)你们当中不论哪个进来将会得到奖

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