高三下册英语知识点整理2021

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高三下册英语知识点整理

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

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。