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初中英语知识点讲解

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  为了帮助大家强化英语知识点的记忆,下面学习啦小编为大家带来初中英语知识点讲解,供大家参考学习。

  初中英语知识点讲解:定语从句

  一、关系代词引导的定语从句

  1、由who, whom, that,Whose引导的从句

  这些词代替的先行词是人的名词或代词,who作主语指人,whom作宾语指人,that既可作主语又可作宾语(作宾语可以省略),可以指人也可以指物。Whose 用来指人或物,只用作定语。

  (1) Is he the man who/that wants to see you? 他是那个想见你的男人吗?(who/that在从句中作主语)

  (2) He is the man whom/ that I saw yesterday. 他就是我昨天见的那个人。(whom/that在从句中作宾语)

  (3) The man whom you spoke to just now is our English teacher 你刚刚说话的那个男人是我们的英语老师

  (4) he man whose son is a doctor is our professor. 那个儿子是医生的男人是我们的教授。

  2、由which, that引导的从句

  它们所代替的先行词是事物的名词或代词,在从句中可作主语、宾语等,作宾语时可以省略,例如:

  (1) Prosperity which / that had never been seen before appears in the countryside. 农村出现了前所未有的繁荣。(which / that在从句中作主语)

  (2) The package (which / that) you are carrying is about to come unwrapped. 你拿那个包裹快要散开了。(which / that在从句中作宾语)

  注意: 代表物时多用which,但在下列情况中用that而不用which:

  a)先行词是anything, everything, nothing , none等不定代词时;

  b)先行词由every, any, all, some, no, little, few, much等修饰时,这时的that常被省略;

  c)先行词前有序数词或被形容词最高级修饰时;

  d)先行词中既有人又有物时;

  e)整个句中前面已有which,who,that时;

  f)当先行词为物并作表语时;

  g)先行词为one时;

  h)先行词同时又被the only,the very,the same修饰时;

  二、关系副词引导的定语从句

  1、when指时间在定语从句中做时间状语也可做连接词用   I still remember the day when I first came to the school.

  2、where指地点在定语从句中做地点状语    Shanghai is the city where I was born.

  3、why指原因在定语从句中做原因状语 ,用在reason 后面。 Please tell me the reason why you missed the plane.

  初中英语知识点讲解:虚拟语气

  一、条件状语从句

  1、与现在事实相反

  若与现在事实相反,虚拟语气的条件从句的谓语用过去式(be通常用were),主句谓语用“should (would, could, might)+动词原形”。如:

  If I were you, I would take an umbrella. 如果我是你,我会带把伞。(事实上我不可能是你)

  If I knew her number I could ring her up. 要是我知道她的电话号码,我就可以给她打电话了。(事实上我不知道)

  2、与过去事实相反

  若与过去事实相反,从句:主语+had done , 主句:主语+should/would/could/might+have done ,例如:

  If I'd left sooner,I'd have been on time. 要是我早点动身,我就准时到了。(但我动身太迟了)

  If I had got there earlier, I should/could have met her. 如果我早到那儿,我就会见到她。 (事实:去晚了)

  3、与将来事实相反

  从句:①if+主语+were to do 主句:①主语+should/would/could/might+do

  ②if+主语+did/were ②主语+should/would/could/might+do

  ③if+主语+should+do ③主语+should/would/could/might+do

  例如:If he went,would you go too? 如果他去,你也去吗?(大概他不会去)

  If he should come here tomorrow, I would talk to him.   如果他明天来这儿的话,我就跟他谈谈。 (事实:来的可能性很小)

  注意与说明:对于与将来事实相反的情形,请注意以下几点:

  一是这里说的与将来事实相反,实为对将来情况的推测;

  二是此用法中的条件从句谓语除用过去式外,有时也用“should+动词原形”(表示可能性极小,常译为“万一”)或“were to+动词原形”(表示与将来事实相反的假设);

  三是当条件从句使用“should+动词原形”这样的谓语时,主句谓语除可用“should (would, could, might)+动词原形”这样的虚拟语气外,也可用陈述语气或祈使语气。如:

  I should see him, I'll tell him. 万一我见到他,我就告诉他。

  If it should rain tomorrow, don’t expect me. 万一明天下雨,就别等我了。

  二、wish 后宾语从句

  1、表示与现在事实相反的愿望,谓语动词用过去式 。例如:

  I wish I had your brains.   我希望我有你那样的头脑。(事实:我根本比不上你)

  2、表示与过去事实相反的愿望,谓语动词:had+done   例如:

  I wish I had knownthe truth of the matter.   我希望我那时就知道这件事情的真相。(事实:那时还不知道)

  3、表示将来难以实现的愿望,谓语动词:should/would(情态动词) + 动词原形

  I wish I should havea chance again.   我希望我还能有一次这样的机会。(事实:很难再有这样的机会了)

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