1.It 作形式主语替代作形式主语替代that从句从句2.1）It is + adj. +that从句从句3.2）It is +v-ed +that 从句从句4.3）It is a pity ( a shame . ) that .5.4）It happens (seems， looks， appears ) that.6.5）It is time ( about time ，high time ) that . 7. It is the first ( second . ) time that .1.1）It is + adj. +that从句从句2. It is clear ( obvious， true， possible certain.) that . 3. It is important ( necessary， right， strange，natural.) that . 从句中要用虚拟语气（从句中要用虚拟语气（should + v.原原形）形）4. 5.1.It is important that students today master English.6.2.It is perfect that you can come to my birhtday party.7.3.It is obvious that we need more practice.8.4.It is strange that he (should) have made a mistake.9.5.It is natural that he fall in love with such a beautiful girl.10.6.Its strange that he feel so angry.1.2）It is +v-ed +that 从句从句2.It is said that Andy Lau will come to Guangzhou tomorrow.3.It was reported that there were 300 people died of this disease.4.It is known that Changjiang River is the second longest river in the world.It was suggested that the sports meet be put off until next Saturday. It is desired that we (should) get everything ready by tonight. It was ordered that the medicine be sent there by plane. 1.3）It is a pity (a shame, no wonder, better) that . 2.It is a pity that we didnt grasp that opportunity.3.It was a great pity that you (should) have made so many mistakes in your math exercise. 4.It will be better that she stay with her grandmother. 1.It happens (seems， looks， appears ) that.2.It happened ( so happened ) that he met his teacher in the street. It happened that her parents were both out. It happened that the harvest was bad that year. It happened that I had driven that kind of car before. It happened that I was standing next to him when he collapsed. It seems that she is very sad.1.it 用作形式主语用作形式主语,指代从句指代从句1.1) It is + adj. +that从句从句2. It is clear ( obvious， true， possible certain.) that . 3. It is important ( necessary， right， strange，natural.) that . 从句中要用虚从句中要用虚拟语拟语气（气（should + v.原形）原形）4.2) It is +v-ed +that 从句从句5. It is said (reported， learned.) that . 6. It is suggested ( ordered /demanded/insisted/commanded. ) that(should + v.原形原形) 7.3) It is a pity ( a shame . ) that . that后的从句一般用虚后的从句一般用虚拟语拟语气（气（should + 动词动词原形）原形）8.4) It happens (seems， looks， appears ) that.9.5). It is time ( about time ，high time ) that . 虚拟虚拟语气语气10. It is the first ( second . ) time that (完成时)11. 1.真可惜，他没来。it is a pity that 2.我们爱自己的父母是很自然的。it is natural that3.很明显，他是是个勤奋又上进的人。it is obvious that4.我恰巧在书店里碰到他。it happened that 5.人人都建议他提前预习考试的内容，但是他不听，难怪他不及格。it was suggested no wonder that6.掌握好英语和计算机技术对于现代人来说是很重要的。it is very important that7.好像他过几天就会回来。it seems that8.真遗憾，这样的事竟然发生在你的班上。it is a pity that 9.大家都知道，要学好英语一定要多读多听多做练习。it is well known that10.那是我第一次到北京。it was the first time that 11.该是我们行动起来保护环境的时候了。it is high time