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1、It作形式主语常见句型l.It + be +形容词+ that-从句可用于此句型的形容词有: wonderful, true，good，right，wrong，(un)important，useless， surprising，disturbing,frightening,alarming,clear，unusual，lucky，certain, necessary 等。 如： It is quite certain that he will be at the meeting他将出席会议是无疑的。 It is surprising that he came late to school th
2、is morning他今天早上迟至U真令人惊讶。 It is important that we (should) study hard我们努力学习是很重要的。注意：该句型中的形容词是(un) important, necessary等时，从句应为(should )+动词原 形。It is important that we (should) learn English well.It is necessary that he (should) remember these words.2.It + be +名词+ that-从句适用该句型的名词(词组)有： a pity， an honor，
3、 a good thing， a fact， a surprise， a question, a shame,a custom, a truth,our hope, no wonder, good/bad manners 等。如： It is a pity (that) you missed the sports meeting last week. 你错过了上周的运动会太 可惜了。 It is a fact that English is being accepted as an international language. 事实上英语已经 被作为一种国际语言而接受了。3. It + se
4、em / appear / happen 的适当形式+that 从句。 It seems that there is a big waste pipe coming down from the town. It appeared that he was calm, but inside his heart was beating wildly with fear.4. It + be + 过去分词 + 主语从句，这类过去分词有： announced, believed, expected, hoped, decided, reported, said, shown 等， 如：It is rep
5、orted that l6 people were killed in the earthquake.It is not decided who will give the operation to the patient.5. It is time ( about time ,high time ) that .该句型中that后的从句应该用虚拟语气，值得注意的是常用过去时态表示虚拟. 有时也用should +动词原形，should不能省。常译为是(正是).的时侯.。 It is time that children should go to bed.= It is time that ch
6、ildren went to bed.6. It is the first ( second . ) time that . 用完成时态。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后 面从句用现在完成时态；如果是一般过去时，后面从句则用过去完成时态。该结构中 that 可 以省去；it有时用this替换.常译为是第一(二).次.。It is the first time I have been here.= This is the first time I have been here.7. It + be + adj./ n. (for sb. / of sb.) +
7、 to do sth. 该句型中的形容词通常是表示事物的特点或 特征的如 difficult, hard, easy, impossible, necessary, important 等，此时用 for；或表示人 的性格特征或特点的如 nice， good， bad， kind， silly， foolish， wise， clever， careless， rude， brave, cruel, careful, grateful 等，这时要用 of。如： It is foolish of you to give up such a good chance. It is necessary for college students to master at least a foreign language.
