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                            	L1語法課-It作形式主語常見句型
                            
                        
    
                        
    
                            
    L1語法課-It作形式主語常見句型
    
                            
    
                                2017-05-13   
                                15'55''
                            
    
                            
    
                                
                                主播： 啟哲英語
                            
    
            				
    
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                            介紹:
                            
    
                                
    It作形式主語常見句型
1.It + be +形容詞+ that-從句
可用于此句型的形容詞有: wonderful, true，good，right，wrong，（un）important，useless，surprising，disturbing,frightening,alarming,clear，unusual，lucky，certain, necessary等。 如： ① It is quite certain that he will be at the meeting.他將出席會議是無疑的。
② It is surprising that he came late to school this morning.他今天早上遲到真令人驚訝。 ③ It is important that we (should) study hard.我們努力學(xué)習(xí)是很重要的。
注意: 該句型中的形容詞是（un）important, necessary等時，從句應(yīng)為 (should )+動詞原形。
It is important that we (should) learn English well.
It is necessary that he (should) remember these words.
2.It + be +名詞+ that-從句
適用該句型的名詞（詞組）有: a pity，an honor，a good thing，a fact，a surprise，a question, a shame,a custom, a truth,our hope, no wonder, good/bad manners等。如：
① It is a pity (that) you missed the sports meeting last week. 你錯過了上周的運動會太可惜了。
② It is a fact that English is being accepted as an international language. 事實上英語已經(jīng)被作為一種國際語言而接受了。
3. It ＋seem／ appear／ happen的適當(dāng)形式＋that從句。
① It seems that there is a big waste pipe coming down from the town.
②It appeared that he was calm, but inside his heart was beating wildly with fear.
4. It + be + 過去分詞 + 主語從句，這類過去分詞有：announced, believed, expected, hoped, decided, reported, said, shown等， 如：
It is reported that 16 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 ...
該句型中that 后的從句應(yīng)該用虛擬語氣，值得注意的是① 常用過去時態(tài)表示虛擬．② 有時也用should + 動詞原形，should 不能省。常譯為＂是（正是）．．．的時侯．．．＂。 It is time that children should go to bed.
= It is time that children went to bed.
6. It is the first ( second ... ) time that ...
用完成時態(tài)。至于用什么完成時態(tài)，由主句的謂語動詞的時態(tài)決定。如果是一般現(xiàn)在時，后面從句用現(xiàn)在完成時態(tài)；如果是一般過去時，后面從句則用過去完成時態(tài)。該結(jié)構(gòu)中 that 可以省去；it有時用 this 替換．常譯為＂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.) + to do sth. 該句型中的形容詞通常是表示事物的特點或特征的如difficult，hard，easy，impossible，necessary，important等，此時用for；或表示人的性格特征或特點的如nice，good，bad，kind，silly，foolish，wise，clever， careless，rude，brave，cruel，careful， grateful等，這時要用 of。如：
① It is foolish of you to give up such a good chance.
② It is necessary for college students to master at least a foreign language.