高中英语主语从句知识点整理
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。
例如: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。
例如: 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
例如:
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。
注: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。
例如:
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。
例如:
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。
例如:
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。
例如:
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。
例如:
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。
例如:
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?