it is 后面动词接什么 为什么it is 一个动词,这个动词经常要用过?

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为什么it

为什么it is 一个动词,这个动词经常要用过?

is 一个动词,这个动词经常要用过?

不是过去式,是过去分词,被动语态。如:It is said that he is a thief. 据说他是个贼。
It is reported that he has been elected mayor of the city. 据报道他当选了市长。

it is倒装句?

Here it is.
完全倒装
1. 用于 there be 句型.
2. 用于“ here ( there, now, then )+不及物动词+主语”的句型中,或以 in, out, up, down, away 等副词开头的句子里,以表示强调.
注意:
( 1 )主语是代词时,主语和谓语不倒装.
( 2 ) here , there 放在句首通常用一般现在时.
3. 当句首状语为表示地点的介词词组.
4. 表语置于句首时,倒装结构为“表语+连系动词+主语”:
( 1 )形容词+连系动词+主语
Present at the meeting were Mr Li, Mr Wang and many other teachers.
出席会议的有李老师、王老师和其他很多老师.
( 2 )过去分词+连系动词+主语
Gone are the days when we used foreign oil.
我们使用洋油的日子一去不复返了.
( 3 )介词短语+ be +主语
Among the goods are books, exercise-books, pens and some other things.
在所有的货物中有书、练习册、钢笔和其他东西.
5. 用于 so, neither , nor 开头的句子,表示重复前句的部分内容.原句的谓语应与前句的谓语的时态、形式相一致.
例如:You cant speak French. Neither can she.
你不会说法语,她也不会.
6. 为了保持句子平衡,或为了强调表语或状语,或是上下文紧密衔接时.
例如: They arrived at a small village, in front of which was a big river.
他们来到一个小村庄,村庄前面是条大河