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1、1.No is permitted here(smoke).It is not very good for you so much(smoke).2.more is necessary(read).It is quite necessary it again(read).3.a language in one month is impossible.(learn),一般来说，表示比较抽象的行为动作时多用doing；表示比较具体的某次行为动作时多用不定式to do。,1.(climb)mountains is interesting1(drive)a car during the rush ho
2、ur must be tiring2._computers is my job.A.To sell B.Sell C.Selling D.Sold3.(teach)English is my job.1(teach)you English this term is my job.,doing作主语时，通常用以表示一件已知的事或经验。to do通常用来表示一件未完成的事或目的。doing 作主语时强调的是做那件事的持续状态，to do 作主语时主要表示现在或者将来的事情,1.学一门外语非常重要。2.覆水难收。3.放弃这一机会是个遗憾。4.撒谎没好处。5.与其诅咒黑暗，不如燃起蜡烛。,It is
3、very important to learn a foreign language.It is useless crying over the spilt milk.It seemed a pity to give up the chance.It is no good telling lies.It would be better to light up candle than to curse the darkness.,It+be+形容词/名词词组+to do sth./doing/that.不定式to do作主语时，常使用形式主语结构；而doing作主语时，较少用形式主语结构，只有在
4、 It is+no use,no good(fun,a great pleasure,a waste of time.)等名词+doing sth.It is+useless(senseless,nice,worth等形容词)+doing sth,It is hard to make him change him mind.It is no good objecting.It is useless speaking.It is not an easy thing to master a language.It is a great fun playing football How would
5、it be to start tomorrow?It is a waste of time trying to explainIt took all his strength to move out of the crowds.It is nice seeing you again Business is business and it will not do to be so careless.It is no good pretending to know what you dont know.It is worth learning another language.,逻辑主语 for
6、the young,the children,It is useless crying over the spilt milk.It seemed a pity to give up the chance.It is no good telling lies.,Its very kind to help me with the work.It seemed selfish not to share his dictionary with others.,It+be+形容词+（for sb.）+动词不定式 这类句型常用形容词easy,difficult,hard,important,possib
7、le，wise等作表语，为了强调不定式的逻辑主语，常在不定式前加for sb，译为“对某人来说做某事怎么样”,It+be+形容词+of sb.+动词不定式 这类形容词常是表示心理品质,性格特征的形容词，如：kind,nice stupid,clever,foolish,polite,impolite,silly,selfish,considerate等。某人和这些形容词可以构成主系表结构。,如：Its very kind of you to help me with the work.=You are kind to help me.It seemed selfish of him not t
8、o share his dictionary with others.=He seemed selfish not to share his dictionary with others.,1.我花了一些时间才读完那段阅读材料。2.至少要九个钟头才能到那儿。3.跟着理智走，要有勇气，跟着感觉走，要有倾其所有的决心。,It took me some time to read the reading materials.It takes at least nine hours to get there.It takes courage to follow your mind.But it take
9、s everything to follow your heart.,It took me some time to read the reading materials.It takes at least nine hours to get there.It takes courage to follow your mind.But it takes everything to follow your heart.,It+takes+(sb.)+some time+to do sth.表示“（某人）花多少时间干某事”的句型，其中it是形式主语，代替后面的不定式（to do sth.），句型中
10、的sb.也可以省略。,在 there is no.句型中的主语只能用doing，并且不能带逻辑主语。如：There is no denying the fact.Well,you have said it and there is no taking it back.上述句子的意思如用不定式to do 则分别为：It is impossible to deny the fact.Well,you have said it and it is impossible for you to take it back.,1._well in an interview is an important p
11、art of getting a place at university.ATo do BDoingCDone DBeing done,2.It is my honor _ here to spend some time with you.Ato be invited BinvitingCbeing invited Dto invite BA,3.Is necessary to take off our shoes when we enter the lab?A.everyone B.this C.her D.it4._ will take you a lot of time to find him in the crowd.A.It B.I C.We D.They5.It is no use his _ there,the situation is hopeless now.to go B.to be going C.going D.having gone,14,谢谢！,15,
