考博英语有关it开头的特殊句型

考博英语 责任编辑:张雪丹 2022-02-17

摘要:常见的it开头的句型有 it is … that … 强调句型,也有it充当形式主语的句型,在这两种句型中,不少学员分不清什么是强调句型,什么时候it充当形式主语。小编为大家整理了有关it开头的特殊句型,更多资讯请关注希赛考博英语频道。

我们先来梳理一下it引导的形式主语句型有哪些:

动词不定式,动名词或主语从句作主语时,通常用it作形式主语,放到句首,而真正的主语放在句尾,常见句型有如下:

1. It + be + 形容词+主语从句,如:

It is uncertain whether he can come to Jenny’s birthday party or not.

2. It + be + 名词词组 + 主语从句,这类名词有:a fact, a pity, a shame, an honor,a question等,如:

It’s a pity that you missed the exciting football match.

It remains a question whether he will come or not.

3. It + be + 过去分词 + 主语从句,这类过去分词有:announced, believed, expected, hoped, decided, reported, said, shown等, 如:

It is reported that 16 people were killed in the earthquake.

It is not decided who will give the operation to the patient.

4. It + 不及物动词(seem, appear, happen等) + 主语从句, 这类不及物动词有:appear, happen, seem等, 如:

It seemed that he didn’t tell the truth.

It happened that I was out when he called.

5. It + be + 形容词 + for sb.)+ 动词不定式

这类句型常用形容词easy, difficult, hard, important, possible,wise等作表语,有时候为了强调不定式动作的执行者,常在不定式前加for sb,如:

It’s necessary for the young to master two foreign language.

It is unwise to give the children whatever they want.

这类形容词有:easy, difficult, hard, important, possible,wise

6. It + be + 形容词 + of sb. + 动词不定式,这类形容词常是表示心理品质,性格特征的形容词,如:kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。某人和这些形容词可以构成主系表结构。如:

It’s very kind of you to help me with the work.

=You are kind to help me.

It seemed selfish of him not to share his dictionary with others.

=He seemed selfish not to share his dictionary with others.

7. It + be +名词词组 + 动词不定式,如:

It is not a good habit to stay up too late.

8. It + be + 名词或形容词 + 动名词,这类名词和形容词常常是:good, no good, no use, a waste of, useless, senseless等,如:

It’s a waste of time talking to her any more.

It is no use arguing about the matter with him.

9. It + take ( sb. )+ 时间(金钱)+ 动词不定式,如:

It took the workers almost three years to finish building the dam.

It will take a whole day to get to the top of the mountain on foot.

而 it 引导的强调句型结构为:It is + 被强调部分 + that …

该句型是强调句型,将被强调的部分放在前面,其他部分置于that之后。被强调部分可以是主语,宾语,表语或状语。如果把那种句型结构划掉后,应该是一个完整无缺的句子。这也是判断强调句型与其他从句的方法。

It was about 600 years ago that the first clock with a face and an hour hand was made.

It was they that cleaned the classroom yesterday.

另外一个it引导的特殊句型为 it is not until + 被强调部分 + that …

该句型主要用于强调时间状语,译成汉语“直到…才…”,可以理解为 not … until 的强调形式:

It was not until she took off her glasses that I realized that she was a famous film star.

= Not until she took off her dark glasses did I realize she was a famous film star.

= I didn’t realize she was a famous film star until she took off her glasses.

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