形式主语it的用法

形式主语it的用法麻烦各位说的简单一点,本人初中,很多方面不是很懂。谢谢。

It
作形式主语常见句型

1.It + be +
形容词
+ that-
从句

可用于此句型的形容词有
: wonderful, true

good

right

wrong


un

important

useless

surprising

disturbing,frightening,alarming,clear

unusual

lucky

certain, necessary
等。

如:



It is quite certain that he will be at the meeting.
他将出席会议是无疑的。



It is surprising that he came late to school this morning.
他今天早上迟到真令人惊讶。



It is important that we (should) study hard.
我们努力学习是很重要的。

注意
:
该句型中的形容词是

un

important, necessary
等时,
从句应为

(should )+
动词原
形。

It is important that we (should) learn English well.

It is necessary that he (should) remember these words.
2.It + be +
名词
+ that-
从句

适用该句型的名词
(词组)

: a pity

an honor

a good thing

a fact

a surprise

a question,
a shame,a custom, a truth,our hope, no wonder, good/bad manners
等。如:



It is a pity (that) you missed the sports meeting last week.

你错过了上周的运动会太
可惜了。



It is a fact that English is being accepted as an international language.
事实上英语已经
被作为一种国际语言而接受了。

3. It

seem


appear


happen
的适当形式+
that
从句。



It seems that there is a big waste pipe coming down from the town.


It appeared that he was calm, but inside his heart was beating wildly with fear.
4. 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.
5. It is time ( about time ,high time ) that ...

该句型中
that
后的从句应该用虚拟语气,值得注意的是①

常用过去时态表示虚拟.②

有时也用
should +
动词原形,
should
不能省。常译为"是(正是)


.的时侯.

."。

It is time that children should go to bed.

= It is time that children went to bed.
6. It is the first ( second ... ) time that ...
用完成时态。至于用什么完成时态,
由主句的谓语动词的时态决定。如果是一般现在时,后
面从句用现在完成时态;
如果是一般过去时,
后面从句则用过去完成时态。
该结构中

that

以省去;
it
有时用

this
替换.常译为"是第一(二)


.次.

."。

It is the first time I have been here.
= This is the first time I have been here.
7. It + be + adj./ n. (for sb. / of sb.) + to do sth.

该句型中的形容词通常是表示事物的特点或
特征的如
difficult

hard

easy

impossible

necessary

important
等,此时用
for
;或表示人
的性格特征或特点的如
nice

good

bad

kind

silly

foolish

wise

clever


careless

rude

brave

cruel

careful


grateful
等,这时要用

of
。如:



It is foolish of you to give up such a good chance.


It is necessary for college students to master at least a foreign language.追问

问下,it做形式主语是动词要用不定式吗?

追答

是的 to do

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第1个回答  2016-10-28
当代英语通常用it 做形式主语定式和动名词置于谓语面特别主语较长时或些习惯用法
1) 谓语系表结构(be + 形容词 / 名词)时常定式置构成句型 it + be + 表语(形容词 / 名词)+ 定式
例 1 It is my duty to care for that patient.
照料位病人我职责(做主语定式to care for that patient 置it 形式主语)
例 2 It is not an easy thing to master a foreign language.
掌握门外语件容易事
例 3 It isn’t right to speak ill of someone behind his back.
别人背说坏对
2) 当谓语 takemakepaycost require feelneed 等动词时或者与情绪有关动词 delightamuseexciteannoyirritate 等时习惯上常用 it 做形式主语并定式置
例 1 It takes only ten minutes to get there.
儿只需十分钟
例 2 It pays to be honest.
诚实会吃亏
例 3 It feels good to stay away from the crowded city.
能远离拥挤城市感觉真错
例 4 It annoyed her to see someone spit on the ground.
看见有人随地吐痰让生气
3) 同定式样动名词也用于it + be + 表语 + 动名词句型二者区别参见10.2.2 1)论述下面两组句子没有多大差异
例 1 A) It is a waste of time to argue with him
B) It is a waste of time arguing with him.
和争辩浪费时间
例 2 A) It is worthwhile to discuss this again.
B) It is worthwhile discussing this again.
点值得讨论下
4) 表语(of)no usenot any usenot the slightest use no good not much goodfun等时常用动名词(用定式)做主语并置用 it 做形式主语
例 It’s no use crying over spilt milk.
覆水难收
5) 动名词还 there be 句型做主语(能用定式)常见形式 there is no + 动名词或 there is no / any + 名词 + 动名词
例 1 There is no denying the fact.
事实无否定
例 2 There isn’t any use trying again.
再试也没用
第2个回答  2016-10-27
  以调制出不同的风味来,这是最简单的烹饪常识.比如丈夫在妻子生日那天献上一束水灵的玫瑰花儿,在妻子的腮边印上甜蜜吻痕的同时,再对妻子说:“老婆,我爱你”于是从妻子嘴角边遗漏出带有皱纹如同少女般的嗔怪:“去,怎么还这么肉麻”的表情里,再品味一次年轻时初恋的情怀.以至能够信心十足着进行完美爱情的接力赛,彼此相携到老.有了这样完美的爱情,我想即使有一天,两个人伫立站黄昏的夕阳下,戴着沧桑的老花镜,咀嚼着岁月的牙齿,仍能品出完美爱情那香喷喷的味道来!
  ---------------------------------------------------------------------------
  爱情没有谁会等谁一辈子
  爱情没有谁会等一辈子,别失去才后悔……
第3个回答  2020-01-06