2021年1月23日发(作者：basic是什么意思)
it
的用法及强调句型

it
的用法

一、
it
作指示代词


【完成句子】用
one< br>，
ones
，
it
，
that
，
those
填空




(1)
—
I can't find my watch.




—

You
haven't
found
______
？

If
you
want
to
buy
a
new
______
，

I
suggest
you
buy
______ made in China.



(2) We've got a big cup and two small ______.



(3) The weight of an elephant is much greater than ______ of a tiger.

(4) The books on the first shelf are easier than ______ on the second shelf.

(5) The boy told his story and ______ of the girl upstairs.

【答案】


(1) it; one; one (2) ones

(3) that

(4) those / the ones


(5) that / the one
【结论
1
】




①指代上文提过的事 物时，
it
指的是同名同物，相当于
the
＋名词；




②
one
指的是同名异物，
表示单数可数名词相当于
a
＋名词；
a / an
＋形容词＋
one
等于
a
/ an
＋形容词＋名词；复数形式用
ones
；




③
that
后面常有后置定语，有特指意义，代替不可数名词或 单数可数名词，相当于
the
＋
名词；




④复数名词用
those
，相当于
the ones
。


【例句观察】
—
Someone is knocking at the door. Who is it?












—
It must be Leo. He said he'd come to see me.

【结论
2
】
it
指代人时，常指小孩或身份不明的人。

【例句观察】
It's too quiet in the room. Everyone just keeps silent.

【结论
2
】
it
可用以指代环境或情况。




(6)
—
What time is it now?
—
It's half past seven.




(7)
—
It is spring now and it's warm these days.


【结论
3
】

it
可用以指代时间、季节、天气或距离。

【注意】

it
指代时间时，有如下一些句型：





(1) It is time for sth. (for sb.)to do sth. / that
－从句
(should do /

did,
必须用虚拟语气
)




例：

①
It's time for lunch.










②
It's time for us to clean the house.










③
It's time that we should clean the house.
＝
It's time that we cleaned the house.





(2) It is

/ has been
＋

some time
＋

since
－从句

(
从句用一般过去时
)
It is 10 years since I graduated from college.



(3)
It
/
This/That
is
the
first

/
second
time
that< br>－从句
(
必须使用现在完成时
)
这是某人
第
……次做了某事。








It / This/That was the first / second time that
－从句
(
必须使用过去完成时
)





例：①
It is the second time that she has visited the Great Wall.









②
This was the first time that I had come late to school.

(4) It was
＋时间点

＋

when
－从句







例：

It was evening when we got home.








＝
It was evening in which we got home.

(5) It was / will be
＋

some time
＋

before
－从句

例：①过了
5
年他们才从北大毕业。








It was five years before they finally graduated from Beijing University.











②不久，我们就要从我们学校毕业了。








It won't be long before we graduate from our school.

二、
it
作形式主语

1.
代替主语从句

①

It is clear ( obvious
，

true
，

possible certain....) that .....

“
清楚
（显然，
真的，
肯定．
．< br>．
）
”


②
. It is important ( necessary
，

right
，

strange
，

natural...) that ...

that
后的从句中要用虚拟语气（
should
+
动词原形），
should
可以省去，建议记住该句型
中的形容词。


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



1