高一英语下学期语法重难点汇总

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2. 表示与过去誓死相反的情况

  ①形式；

 

条件从句的动词形式

主句的动词形式

If I (we,you,he,she,it,they)+had+过去分词

I (we) should

You (he,she ,     +have+过去分词或：

they,it ) would

所有人称+could(might)+have+过去分词

②用法：

   I would have checked my paper again if I had had more time at yesterday’s examination.(fact:I had no more time at yesterday’s exam, so I didn’t check my paper again)

   You would have already recovered from his illness if he had seen the doctor in good time.(fact: He didn’t see the doctor in good time ,so he hasn’t recovered from his illness )

3. 表示与将来事实相反的情况

 ①形式：

 

条件从句的动词形式

主句的动词形式

1. If I (we,you,he,she,it,they)+行为动词的过去式（be的过去式一般用were）通常要与一个表将来的时间的状语连用
2. If (we,you,he,she,it,they)+should

+动词原形

c. If I (we,you,he,she,it,they)+were to+动词原形

I (we) should

You  would         +动词原形或：

he(she,it ) would

they would

I (we,you,he,she,it,they)+could(might)+动词原形

②用法：

  If it rains tomorrow, our picnic will be put off.(The weather has been changeable these days.)

 If it rained tomorrow, our picnic would be put off.( The weather has beenvery good these days.)

If it should rain tomorrow, our picnic would be put off.(That would be out of our expectation.)

If it were to rain tomorrow, our picnic would be put off. (条件从句谓语动词用were to +动词原形，表示 下雨的可能性极小。Were to rain和should rain 都表示“出乎意料之外”，但were to加强表示“当初没想到以后的事”)

3. 混合时间条件句的用法：

有时条件从句的动作和主句动作发生的 时间不一致。这时动词的形式，应根据它所要表达的具体时间来决定用什么形式。

1. If she hadn’t trained so hard, she wouldn’t be run so fast.（从句叙述过去，主句叙述现在。）

（fact: she has trained very hard, so she would able to run fast.）

2)You would speak English well enough if you had practised reading and speaking it every day.(主句叙述现在，从句叙述过去)

 （fact: You didn’t practice (hasn’t practiced ) reading and speaking it every day, so you can’t speak English well enough.）

1. 在其他状语从句中的用法

  主要用于由as if (as though) 引导的比较状语从句，从句中谓语动词一般用“动词的过去式（be 变were ）或had +过去分词。”

如：

She looked as if she were ill.(实际上她没有病，在这里用虚拟语气补语比喻她精神不佳)

 Xiao Liu speaks English so well as if he had studied in England.(这里用虚拟语气表现他的 英语说得好)

 

（2）、在主语从句中的用法：

  通常由形式主语it引出的主语从句来表达。主语从句中，谓语动词用“should+动词原形”；表示“必要”“重要”“奇怪”等意思。

It is necessary that you should clean the workshop after work.下班后你必须清扫车间。

It is important that we should ask advice of other people about our work.在工作中，征求别人的意见是很重要的。

在宾语从句中的用法（详见《高一上学期英语语法重难点集汇》）

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