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“It is adj.”是初中英语中出现频率非常高的句型之一，现将常见的“It is adj.”句型归纳如下。
一、It is adj. that 从句
此句型常用来说明对某事的感受，其中it是形式主语，that引导的从句才是真正的主语，通常放在句尾。适用于此句型的形容词有：necessary， clear， true， strange， certain， likely， meaningful， important， possible， lucky等。如：
It is necessary that we help those disabled people.
我们帮助那些残疾人是必须的。
It’s very clear that they badly need help.
很明显，他们非常需要帮助。
It is very meaningful that they donate some money to Project Hope.
他们为希望工程捐款是非常有意义的。
二、It is adj. to do sth.
此句型常用来描述行为动作和情境。如：
It is difficult to finish the work today.
今天完成这项工作很困难。
It is not easy to learn a foreign language well.
学好一门外语不容易。
It is interesting to play with snow in winter.
冬季玩雪很有趣。
【相关连接】
1. 在此句型中，动词不定式to do sth.也可直接放在句首作主语，但在现代英语中，这样用的不多。如：
To give is much better than to receive. = It is better to give than to receive.
给予远胜于接受（予胜于求）。
2. 此句型中的形容词可换为名词，be也可换为其他连系动词，如feel等。如：
It’s a good habit to get up early and go to bed early.
早睡早起是好习惯。
It must be great fun to fly to the moon in a spaceship.
乘宇宙飞船飞往月球一定很有趣。
It feels strange to have a twin sister.
有个孪生姐妹，感觉很奇怪。
三、It is adj. for sb. to do sth.
此句型中，动词不定式的逻辑主语是for后面的人或物，表示“干某事对某人/某物来说怎么样”。适用于此句型的形容词有：easy， difficult， hard， important， necessary， quick， dangerous等。这些形容词常常与事物的特征有关，用来修饰动词不定式。如：
It is quite difficult for them to find out who broke the window.
对他们来说，找出谁打破窗户是很困难的。
It’s important for us to keep the water clean.
对我们来说，保持水质清洁很重要。
It’s dangerous for children to cross the busy street.
对孩子们来说，穿过车水马龙的街道是很危险的。
【注意】
此句型有时也可与“It is adj. that 从句”句型互换使用。如：
It’s possible for us to win the match. = It’s possible that we will win the match.
对我们来说，赢得这场比赛是很有可能的。
四、It is adj. of sb. to do sth.
此句型常用来表示人的内在品质。适用于此句型的形容词有：kind， nice， clever， polite， careless， generous， good， thoughtful， silly等。如：
It is very kind of you to help me with my English.
你能帮助我学英语真是太好了。
It was silly of us to believe him.
我们真是太愚蠢了，竟然相信他。
It is generous of David to lend me his bike.
大卫真大方，把他的自行车借给了我。
牛刀小试
（ ）1. In fact ______ is a hard job for the police to keep order in an important football match.
A. this B. that C. there D. it
（ ）2. It’s not nice ______ little boys to do such things. A. on B. to C. of D. with
（ ）3. It will take us a whole term ______ the stories by Shakespeare.
A. to study B. study C. studying D. studies
（ ）4. It is very difficult ______ the girl ______ out the problem.
A. to； work B. of； to work C. for； to work D. with； working
（ ）5. —Don’t you think the paper is very good？
—Yes. It is very pleasant ______.
A. to write on B. to write in
C. to be written on D. to be written in
（ ）6. It’s important ______ we ______ the water clean.
A. that； keep B. for； keep C. for； to keep D. of； to keep
（ ）7. To make friends with them ______ nice.
A. is B. are C. be D. does
（ ）8. It is ______ of Mary to make model planes.
A. clever B. silly C. kind D. good
（ ）9. ______ is generous of David to lend me his bike.
A. There B. It C. Here D. He
（ ）10. It’s stupid of you ______ think you are always right.
A. for B. in C. to D. by
一、It is adj. that 从句
此句型常用来说明对某事的感受，其中it是形式主语，that引导的从句才是真正的主语，通常放在句尾。适用于此句型的形容词有：necessary， clear， true， strange， certain， likely， meaningful， important， possible， lucky等。如：
It is necessary that we help those disabled people.
我们帮助那些残疾人是必须的。
It’s very clear that they badly need help.
很明显，他们非常需要帮助。
It is very meaningful that they donate some money to Project Hope.
他们为希望工程捐款是非常有意义的。
二、It is adj. to do sth.
此句型常用来描述行为动作和情境。如：
It is difficult to finish the work today.
今天完成这项工作很困难。
It is not easy to learn a foreign language well.
学好一门外语不容易。
It is interesting to play with snow in winter.
冬季玩雪很有趣。
【相关连接】
1. 在此句型中，动词不定式to do sth.也可直接放在句首作主语，但在现代英语中，这样用的不多。如：
To give is much better than to receive. = It is better to give than to receive.
给予远胜于接受（予胜于求）。
2. 此句型中的形容词可换为名词，be也可换为其他连系动词，如feel等。如：
It’s a good habit to get up early and go to bed early.
早睡早起是好习惯。
It must be great fun to fly to the moon in a spaceship.
乘宇宙飞船飞往月球一定很有趣。
It feels strange to have a twin sister.
有个孪生姐妹，感觉很奇怪。
三、It is adj. for sb. to do sth.
此句型中，动词不定式的逻辑主语是for后面的人或物，表示“干某事对某人/某物来说怎么样”。适用于此句型的形容词有：easy， difficult， hard， important， necessary， quick， dangerous等。这些形容词常常与事物的特征有关，用来修饰动词不定式。如：
It is quite difficult for them to find out who broke the window.
对他们来说，找出谁打破窗户是很困难的。
It’s important for us to keep the water clean.
对我们来说，保持水质清洁很重要。
It’s dangerous for children to cross the busy street.
对孩子们来说，穿过车水马龙的街道是很危险的。
【注意】
此句型有时也可与“It is adj. that 从句”句型互换使用。如：
It’s possible for us to win the match. = It’s possible that we will win the match.
对我们来说，赢得这场比赛是很有可能的。
四、It is adj. of sb. to do sth.
此句型常用来表示人的内在品质。适用于此句型的形容词有：kind， nice， clever， polite， careless， generous， good， thoughtful， silly等。如：
It is very kind of you to help me with my English.
你能帮助我学英语真是太好了。
It was silly of us to believe him.
我们真是太愚蠢了，竟然相信他。
It is generous of David to lend me his bike.
大卫真大方，把他的自行车借给了我。
牛刀小试
（ ）1. In fact ______ is a hard job for the police to keep order in an important football match.
A. this B. that C. there D. it
（ ）2. It’s not nice ______ little boys to do such things. A. on B. to C. of D. with
（ ）3. It will take us a whole term ______ the stories by Shakespeare.
A. to study B. study C. studying D. studies
（ ）4. It is very difficult ______ the girl ______ out the problem.
A. to； work B. of； to work C. for； to work D. with； working
（ ）5. —Don’t you think the paper is very good？
—Yes. It is very pleasant ______.
A. to write on B. to write in
C. to be written on D. to be written in
（ ）6. It’s important ______ we ______ the water clean.
A. that； keep B. for； keep C. for； to keep D. of； to keep
（ ）7. To make friends with them ______ nice.
A. is B. are C. be D. does
（ ）8. It is ______ of Mary to make model planes.
A. clever B. silly C. kind D. good
（ ）9. ______ is generous of David to lend me his bike.
A. There B. It C. Here D. He
（ ）10. It’s stupid of you ______ think you are always right.
A. for B. in C. to D. by