高中英语中常用it固定句型结构

高中英语中常用it固定句型结构
1. It was/will be long(时间one week/two years ...)+before从句。

译为“很久(一周/两年后……)才……”。

如:It will be long before he is back .很久以后他才回来。

2. It is/has been/was + some time + since从句. 译为“自从……以来已经有多长时间了”。

如: It has been three days since he was ill.他生病已经有三天了。

注意: 如果since从句中的谓语动词为延续性动词时, 应译为“自从不……以来已经有多长时间了”。

如: It is / has been seven years since I taught in this school. 我离开这所学校已经有七年了。

时态的把握:如果主句运用的是一般现在时或现在完成时,那么since引导的从句用一
般过去时;如果主句运用的是一般过去时,那么since引导的从句常用过去完成时。

3. It + be + the +序数词+ time + that从句. 译为“是某人第几次做某事了”。

如:
It is the first time that I have .come here这是我第一次来这儿。

注意:如果主句是一般现在时或一般将来时,从句用现在完成时;如果主句是一般过去时,从句用过去完成时。

4. It +be +具体时间+ when ...译为“当某事发生时,时间是在……”。

如:
It was 10:00 when they arrived at the factory. 他们到达工厂时是十点。

5.It is (high) time that sb．did sth．该句型表示“某人现在该做某事了”，从句常用过去时（虚拟语气）。

如：It is high time that you got up.
6．It is ＋adj．(＋for sb．／sth．) ＋to do sth．常用的形容词有：easy，hard，difficult，possible， important，impossible，necessary，good，bad，exciting， interesting，surprising 等。

如：It is necessary to change your job．
7．It is ＋n．(＋for sb．／sth．) ＋to do sth．常用的名词有：pity, shame, pleasure, one’s duty, one’s job, fun, joy, good manners, bad manners等。

如：
It is a pity for you to have missed such a wonderful play．
It is good manners for the young to take up the seats for the old．
8．It is ＋adj．＋of sb．＋to do sth．
此句型中的形容词主要描述某人的品德、特征。

能用于该句型的形容词有：
kind, nice, wise, silly, polite, impolite, friendly, foolish, clever等。

如：
How silly it was of you to give up such a good chance！
9．It is ＋adj．（＋n．）＋doing sth．
此句型中的形容词和名词常见的有：no／little use, no／much good,
useless等。

如：
It’s no use crying over spilt milk．
10．It takes /took sb．＋一段时间＋to do sth．表示“做某事花费某人多长时间”。

如：It took us half an hour to ride to the town .
11．It is ＋及物动词的过去分词＋that从句
此句型中常见的及物动词的过去分词有：said, told, known, reported,
recorded, thought, believed, considered等。

如：
It is reported that the Russian President will visit China next week．
12．It ＋不及物动词＋that从句
此句型中不及物动词常见的有：seem，happen，appear，matter等。

如：
It seems that there will be a heavy snow tomorrow．
It happened that I met my good friends in the museum yesterday．
13．强调句型：It is＋被强调部分＋that／who从句
在使用强调句型时要注意，指人时可以用who或that，其它情况一律用that。

如：It was under the bed that my brother hid the ball this morning．
14. make it 表示“成功;做到;赶上”。

如:
The train is due to leave in five minutes ? we will never make it .
火车再有五分钟就开了,我们是绝对赶不上了。

15. see to it that ... 注意;留神;负责
See to it that everything is ready.
注意一切都要准备就绪。