作主语的词:名词,代词,名词化了的动词,形容词,分词,副词或数词等,动词不定式或不定式短语, 从句,某些固定词组。
主语,是执行句子的行为或动作的主体,如“我写字”中的“我”,就是主语,它做出“写”这个动作。“写”则是谓语,用来修饰主语,而“字”是接受谓语“写”这个动作的对象,它因此被称为宾语,有的语法书也称它为“客体”或“受体”。 句子成分划分时,主语符号为双横线。
句子做主语的情况:
〔1)that引导的从句,无意义,不担当句子成分,不省略
a. It +v+ that从句
b. It +系动词+表语+that 从句
c. It is strange that he didn't come here yesterday:奇怪的是,昨天他没来这里
当形容词为important necessary strange /that should +动词原形
It is strange that he should (表示吃惊)pass the exam:奇怪的是,他可以通过考试
〔2)It is +n +that 从句
What a pity it is that you didn't come to this party:真遗憾你没来这个聚会
当名词为a pity/a shame /a surprise +should +v原形(表示竟然)
What a pity that she should be fail in exam:真遗憾,她竟然考试不及格
〔3) It is +过去分词+that 从句
It is reported that a car accident happened there:据报道,发生一场车祸
从句s +be v-ed + inf.
He is said to be studying in the USA:据说他在美国学习
有人建议suggest/order/request + 从句 should +动词原形
〔4) It +动词原形seem/appear /turn out/+that
It seems that it will rain:看来要下雨