高三下册英语关键知识难点整理
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高三下册英语知识点整理1
虚拟语气在一些特殊词中的使用或含蓄条件句
1.wish后的宾语从句。
与现在愿望不一致,用主语十过去时,例如:
I wi。hIwere you.
与过去愿望不一致,用主语+had+过去分词,例如:Iwish I had visited the White House whenI was in the States与将来愿望不一致,用主语+would (could)+原形。
2.It's time句型:当lt's tine后用that从句时应该为主i吾+should+动词原形或主语十过去时,例如:It,s time thatyou went to school.或It's time that you should go to schooL
3- If only引起的感叹句相当于“How I wish+宾语从句”。
(l)If only he could come.他要能来就好了。
(2)If only I had known the answer.我要早知道答案就好了。
4.WOuld rather,as if(though)引导的从句也需使用虚拟语气,表示过去的情况用过去完成时,表示现在与将来的情况用过去时,例如:
(l)I'd rather you posted the letter right away.
(2)She loves the children as if they were hers.
5.含蓄虚拟条件句含蓄条件句是指句中没有明显的虚拟条件句,而是利用其他手段来暗示存在虚拟条件。但是这类隐含式虚拟条件句往往都可以转化为if引导的条件句。常用来表示含蓄虚拟条件的手段有:
(1)介词或介词短语。如but for,but that,without,in case of, under more favorable condition等。
(2)连词。如so that, unless, in case, supposing,lest, provided(倘若……),for fear that(唯恐),in orderthat, on condition that, if only(要是……就好了)等。
注意:lest, for fear that和in case引起的从句中谓语动词多用should+动词原形,但也可以不用虚拟语气,而用动词的陈述语气形式。例如:The foreign teacher spokeslowly in case we misunderstood him这位外籍教师说得很慢以免我们误解。
(3)通过上下文及内在含义,句中往往有but,otherwise, unfortunately等类似转折词。
without, but. but for, otherwise引起的短语或句子常暗含着含蓄条件。例如:
①Without you,1 would never know him
②But for your oooperation, we wouldn't have done it
③But that she was afraid, she would have said no. .
④i would be most glad to help you, butI am busy now.
⑤I would have come to the party yesterday, but ljwas working.
⑥I am busy now, otherwise l would do you the favor!
高三下册英语知识点整理2
用来作主语的句子叫做主语从句。如:
(1)When he was born is unknown. 他生于何时还不知道。
(2)What he did last night is being investigated. 他昨天晚上干了些什么正在调查之中。
在主语从句中须注意:
1. 主语从句一般用it作形式主语,放在句首,而将主语从句放到句末。如:
(1)It is possible that he has stolen the car. 很可能他偷了小车。
(2)Isn’t it strange that he should not have passed the test? 他测试没有通过,难道不奇怪吗?
2. if引导主语从句时,只能用it作形式主语,放在句首,而将if引导的主语从句放到句末。如:
It is uncertain if he will leave for Beijing tomorrow. 明天他是否去北京还不敢肯定。
3. that引导主语从句放在句首时,that不可省,但在句末口语中可省。如:
That he was ill yesterday is known now. 大家都已知道他昨天生了病。
4. 连接代词引导主语从句只能放在句首。如;
(1)Who has broken the glass is unknown. 谁打破了玻璃现在还不知道。
(2)What he wants is all here. 他所要的东西都在这里。
5. 主语从句中主句的谓语动词一般用第三人称单数形式,但what引导主语从句的主句谓语动词的形式须根据句子的意思来判断。如
(1)How he worked it out is still a secret. 他是如何把它做出来的还是一个秘密
(2)What they makes in this factory are TV sets. 他们在工厂里所做的东西就是电视机。
高三下册英语知识点整理3
现在完成时
1、 现在完成时的概念:现在完成时表示动作发生在过去,其结果对现在有影响。 例:Tom has gone out (go的动作发生在过去,对现在有影响)
2、 延续性动词可以和表示一段时间的时间状语连用;非延续性动词则不可以。 例:正确说法:The train has been in the station for two hours;
错误说法:The train has stopped in the station for two hours.
(这辆火车进站停了两个小时)
延续性动词 非延期性动词
定义 动作有持续性,可以持续一段时间。如:live(居住)就可live一年两年。 运作在短时间内结束,不能延续。如marry(结婚)就不能marry一年两年。
例词 Listen,play,rain,work Arrive,begin,borrow,finish
3、现在完成时的构成:
(1)have(has)+过去分词:Tom has gone out。
(2)现在完成时的否定和疑问形式:否定形式在have、has后加not;疑问形式将Have、has提前,如Has Tom gone out。
(3)过去分词的概念及其变化形式:
概念:它和现在进行时中的“动词的ing形式”一样,只是英语中表达时态的一种固定形式。
变化形式:大多数动词的过去分词的外形和动词的过去式完全一样。只有那些不规则变化的动词,不运词的过去式不一样。具体参照“不规则动词表”。