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It句型是高考的测试重点。在平时的学习中，同学们对“It+be+时间+从句”这个结构的认识经常混淆不清，现将常见的几种it句型例举如下，供大家学习参考。
1. “It+be+时间+since ...”表示“自从……以来已有多长时间了”
这个句型表示从since 从句的谓语动作发生以后到现在或过去所经过的一段时间。在此句型中，若从句中谓语动词为短暂性动词，则句意为“自从（短暂性动词表示的动作开始）以来，已经……时间了”；若从句中谓语动词为延续性动词，则句意为“自从（延续性动词表示的动作结束）以来，已经……时间了”。例如：
It is ten years since he came back. 自从他回来已有十年的时间了。
It had been fifteen years since she left Shanghai. 自从她离开上海已经有十五年了。
2. “It+be+时间段+before ...”表示“过……时间就会发生某事”
这个句型中的时间一般为表示一段时间的词语(如：long years, months, weeks, days, hours)。主句中的谓语动词用肯定式，意为“过多长时间才……”；主句的谓语动词是否定式时，意为“没过多长时间就……”。主句的时态可用过去时was或将来时will be。用was时，before从句的动词用一般过去时；用will be 时，before从句常用一般现在时。例如：
It was not long before she learned those poems by heart. 她没过多久就背会了那些诗歌。
It will be hours before he makes a decision. 要过好几个小时他才会作出决定。
It will not be hours before we meet again. 要不了几个小时我们还会再见面的。
3. “It+be+时间+when ...”表示“某事发生的时间是……”
这个句型中，主句中的it指时间，表语由具体的时间充当。主句中的谓语动词和从句中的谓语动词在时态上一般是一致的，但当主句是将来时时，when从句常用一般现在时代替将来时。例如：
It was five o’clock when he came here. 他是在五点钟来到这里的。
It was already 8 o’clock when we got home. 当我们到家时，已经8点钟了。
It will be midnight when they get there. 他们到达时将会是午夜时分。
4. “It is time (high time)+that ...”表示“（正）是……做某事的时候了”
这个句型属虚拟语气，that从句中的谓语动词一般用动词的过去时或“should+动词原形”，should 不能省。在time之前有时可加上high或about 以加强语气。例如：
It is time (that) we handed in our exercises. (= It is time that we should hand in our exercises.) 该是我们交作业的时候了。
It is high time that you went to school. 是你上学的时候了。
5. “It+be+the first (second, third ...) time+ that ...”表示“这是某人首次（第二次，第三次……）做某事”
在这个句型中，如果主句的谓语动词be是一般现在时，则从句中的谓语动词用现在完成时；若主句的谓语动词be是一般过去时，则从句中的谓语动词要用过去完成时。It有时用this替换。例如：
It is the second time I have come here. 这是我第二次来到这里。
It was the first time that he had worked in the company. 这是他第一次在这家公司上班。
6. “It is not until+被强调部分+that ...”表示“……直到……才……”
该句型也是强调句型，主要用于强调时间状语，可以说是 not ... until ... 的强调形式。例如：
It was not until yesterday evening that I learned the news. 直到昨天晚上我才知道这个消息。
It was not until she took off her dark glasses that I realized she was a famous film star. 直到她摘下墨镜我才知道她是位著名的电影明星。
[【练习】]
1._______________（直到她走近我）that I realized she was my former friend. （come）
2. It was five o’clock in the afternoon
（他们登上山顶）. （climb）
3. It was the fourth time that he
(犯同样错误). (make)
4. It was midnight_______________（我来到这儿）yesterday. （get）
5. How long do you think （需要多久）the computer company brings out a new product? （it）
6._______________ （直到）ten o’clock that he went to bed. （until）
7. It was at midnight_______________（我回到家）last night. （return）
8._______________ （要不了多久） we know the result of the examination. (long)
9._______________ （直到10点）that he came home last night. （it）
10._______________（我们通常花半小时）go to work by taxi. (take)
11. It’s high time that （我们玩游戏）. (play)
12._______________（直到父亲回来）that he began to do his homework. (come)
13. I was just about to set out
（这时开始下雨）. (begin)
14. — Did your manager phone you again the next day?
— No,_______________（过了两周他才）he gave me a second call. （fortnight）
15. Come and see me when
（你方便的时候）. （convenient）
[【参考答案】]
1. It was not until she came close to me
2. when they climbed up to the top of the mountain
3. had made the same mistake
4. when l got here
5. it will be before
6. It was not until
7. that l returned home
8. It won’t be long before
9. It was not until 10 o’clock
10. It usually takes us half an hour to
11. that we played/should play games
12. It was not until his father came back
13. when it began to rain
14. it was a fortnight before
15. it’s convenient to/for you
1. “It+be+时间+since ...”表示“自从……以来已有多长时间了”
这个句型表示从since 从句的谓语动作发生以后到现在或过去所经过的一段时间。在此句型中，若从句中谓语动词为短暂性动词，则句意为“自从（短暂性动词表示的动作开始）以来，已经……时间了”；若从句中谓语动词为延续性动词，则句意为“自从（延续性动词表示的动作结束）以来，已经……时间了”。例如：
It is ten years since he came back. 自从他回来已有十年的时间了。
It had been fifteen years since she left Shanghai. 自从她离开上海已经有十五年了。
2. “It+be+时间段+before ...”表示“过……时间就会发生某事”
这个句型中的时间一般为表示一段时间的词语(如：long years, months, weeks, days, hours)。主句中的谓语动词用肯定式，意为“过多长时间才……”；主句的谓语动词是否定式时，意为“没过多长时间就……”。主句的时态可用过去时was或将来时will be。用was时，before从句的动词用一般过去时；用will be 时，before从句常用一般现在时。例如：
It was not long before she learned those poems by heart. 她没过多久就背会了那些诗歌。
It will be hours before he makes a decision. 要过好几个小时他才会作出决定。
It will not be hours before we meet again. 要不了几个小时我们还会再见面的。
3. “It+be+时间+when ...”表示“某事发生的时间是……”
这个句型中，主句中的it指时间，表语由具体的时间充当。主句中的谓语动词和从句中的谓语动词在时态上一般是一致的，但当主句是将来时时，when从句常用一般现在时代替将来时。例如：
It was five o’clock when he came here. 他是在五点钟来到这里的。
It was already 8 o’clock when we got home. 当我们到家时，已经8点钟了。
It will be midnight when they get there. 他们到达时将会是午夜时分。
4. “It is time (high time)+that ...”表示“（正）是……做某事的时候了”
这个句型属虚拟语气，that从句中的谓语动词一般用动词的过去时或“should+动词原形”，should 不能省。在time之前有时可加上high或about 以加强语气。例如：
It is time (that) we handed in our exercises. (= It is time that we should hand in our exercises.) 该是我们交作业的时候了。
It is high time that you went to school. 是你上学的时候了。
5. “It+be+the first (second, third ...) time+ that ...”表示“这是某人首次（第二次，第三次……）做某事”
在这个句型中，如果主句的谓语动词be是一般现在时，则从句中的谓语动词用现在完成时；若主句的谓语动词be是一般过去时，则从句中的谓语动词要用过去完成时。It有时用this替换。例如：
It is the second time I have come here. 这是我第二次来到这里。
It was the first time that he had worked in the company. 这是他第一次在这家公司上班。
6. “It is not until+被强调部分+that ...”表示“……直到……才……”
该句型也是强调句型，主要用于强调时间状语，可以说是 not ... until ... 的强调形式。例如：
It was not until yesterday evening that I learned the news. 直到昨天晚上我才知道这个消息。
It was not until she took off her dark glasses that I realized she was a famous film star. 直到她摘下墨镜我才知道她是位著名的电影明星。
1._______________（直到她走近我）that I realized she was my former friend. （come）
2. It was five o’clock in the afternoon
（他们登上山顶）. （climb）
3. It was the fourth time that he
(犯同样错误). (make)
4. It was midnight_______________（我来到这儿）yesterday. （get）
5. How long do you think （需要多久）the computer company brings out a new product? （it）
6._______________ （直到）ten o’clock that he went to bed. （until）
7. It was at midnight_______________（我回到家）last night. （return）
8._______________ （要不了多久） we know the result of the examination. (long)
9._______________ （直到10点）that he came home last night. （it）
10._______________（我们通常花半小时）go to work by taxi. (take)
11. It’s high time that （我们玩游戏）. (play)
12._______________（直到父亲回来）that he began to do his homework. (come)
13. I was just about to set out
（这时开始下雨）. (begin)
14. — Did your manager phone you again the next day?
— No,_______________（过了两周他才）he gave me a second call. （fortnight）
15. Come and see me when
（你方便的时候）. （convenient）
[【参考答案】]
1. It was not until she came close to me
2. when they climbed up to the top of the mountain
3. had made the same mistake
4. when l got here
5. it will be before
6. It was not until
7. that l returned home
8. It won’t be long before
9. It was not until 10 o’clock
10. It usually takes us half an hour to
11. that we played/should play games
12. It was not until his father came back
13. when it began to rain
14. it was a fortnight before
15. it’s convenient to/for you