Itis句型 “It”典型句型例释.docx

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1、Itis句型 “It”典型句型例释“It”典型句型例释孔祥发王爱萍 11月7日“It”句型始终是近几年NMET命题的热点，同时也是日常教与学的重点和难点。在教材和练习中频频出现，由于其繁杂多变，尤其是一些近似句型的辨析，常使同学们望而却步。笔者在平常的教学中，留意收集这样的句子，现将这些句子分类整理并作一简析，希望能对同学们的学习有所帮助。 1It is 3 years _ he joined the army. It will be 3 years _ we meet again. Tom told me that it was 3 years _ he had left school. A

2、.before B.after C.since D.when 析：C，A，C。做这类题目应从时态入手。句是一个主从复合句，该句型常是：It+is（has been）+some time+since sb.did sth.主句用一般现在时或现在完成时，而从句则用一般过去时。句为It will be （was）+some time before sb.does（did） sth.“多久某人干”。主句要用一般将来时或一般过去时，before引导的从句则用对应的 一般现在时或一般过去时。又如： It wasnt long before we met again. 不久我们又见面了。 句与句是同一句型，

3、只不过该句型出现在told引导的宾语从句之中了，故用了was和 had left 的形式。 2._ is wellknown to us all that the earth is round. _ is wellknown to us all,the earth is round. A.That B.As C.It D.Which 析：C，B。句中it是形式主语，真正的主语是从句“that the earth is round ”。句中as引导一非限制性定语从句，代替后面整句内容，置于句首。 3.Was it the house _ Abraham Lincoln was born? Was

4、 it in the house _ Abraham Lincoln was born? A.that B.where C.which D.both A and B 析：B，A。句的先行词是the house,后面为一个定语从句，所以可填where或in which。句为强调句型。推断一个句子是否是强调句型，先把it isthat这一结构抛开，看其余部分能否构成一个完整的句子。那么，句还原为Abraham Lincoln was born the house.the house之前缺少介词in，故不为强调句了。句则相符，故选that。 4.Its very kind _ you to help

5、 us. Its very important _ us to keep the balance of nature. A.for B.of C.to D.with 析：B，A。在句中，常见的形容词有kind,good,nice,foolish,stupid,wrong,clever 等。他们用来修饰人，表示人物的品质或性格特征。句可变为Youre very kind to help us.所以选B。而句则不行，因其形容词只能修饰后面的不定式，故用for。 5._ no wonder that he has passed the exam. _ no need for you to wait

6、here. A.There being B.It was C.It is D.There is 析：C，D。句为“无怪”之意，it为形式主语，that从句为真正主语，该句型还常以No wonder，Small wonder或Little wonder等省略形式出现。又如：No wonder he was punished by his father。句为固定句型，多为否定句或疑问句。又如：Is there any need to explain further?有必要更进一步说明吗? 6.It is strange that he _ the work in 3 days. It is pos

7、sible that he _ the work in 3 days. A.can finish B.is finishing C.should finish D.finish 析：C，A。在it is necessary（important,strange,natural）等结构的句子中，其后的主语从句用虚拟语气，结构为“should+动词原形”。 7.It is （high） time that we _ to school. It is the second time that we _ to Beijing. A.go B.went C.have been D.have gone 析：

8、B，C。句为It is （high）time 引导的定语从句，应用虚拟语气，其结构为“过去式或should+动词原形”，should不行省略。句的先行词time由序数词修饰，从句要用完成时态，且时态要和主句保持一样。又如： It （This/That）was the third time that he had been invited to our school. Itll be the fourth time that hell have been there. 8._ doesnt matter much whether hell come to the party. I feel _

9、an honour to be invited to speak here. A.this（This） B.it（It） C.that（That） D.what（What） 析：B，B。在句和句中it分别作形式主语和形式宾语，故不能用this或that代替。 9.Its no good _ such a thing. Its of no importance _ such a thing. A.do B.to do C.doing D.done 析：C，B。句常用doing作真正的主语，故选C。类似句型还有Its no use （useless）crying over the spilt mi

10、lk.句则只能用不定式作真正主语。再如Its important/helpful/good/necessary/possible/right/ wrong+to do。 10.It is hoped that you _ there on time. It is advised that you _ there on time. A.arrive B.should arrive C.will arrive D.both A and B 析：C，D。句是it作形式主语，that从句作真正的主语。主从句时态一样是解题的关键。类似句型有：Its said/believed/hoped/expecte

11、d/reported/announced/whispered that等等。做这类题目时，还应留意其转变题型。例如： （NMET99） Robert is said _ abroad,but I dont know what country he studied in. A.to have studied B.to study C.to be studying D.to have been studying 假如把首句变为It is said that Robert _,再结合后面的“studied”便可轻易得出答案A。 句It is advised that=sb.advises that,所以仍需用虚拟语气，谓语动词为should do或do的形式。类似的句型还有It is insisted/ordered/suggested/demanded/required /requested that等等。