学习重点：The Zero Conditional 条件句类型0
The First Conditional 条件句类型1
The Second Conditional 条件句类型2
Formation of the Past Conditional 对过去进行推测的条件时态的构成
The Third Conditional 条件句类型3
The Zero Conditional 条件句类型0
我们已经学过了条件句类型0、1、2、3。在这里，我们粗略地总结一下。
条件句类型0用在叙述普遍时，意思是“……时，一般都会……样”。
表示的内容不受时间限制。
|
条件分句 |
主句（结果句） |
|
现在时 |
现在时 |
|
If you leat water to 100 °C |
it(always) boils. |
|
If you don’t water plants, |
they die. |
|
If someone’s rude to me, |
I hit them. |
The First Conditional 条件句类型1
条件句类型当满足条件时，将来可能会发生某事。
|
条件分句 |
主句（结果句） |
|
|
现在时 |
表示将来、命令、现在的情态动词 | |
|
If it rains, |
we’ll watch television. |
预测 |
|
we’re going to watch television. |
意图 | |
|
I’m meeting Peter for lunch. |
定好的计划 | |
|
don’t go out. |
命令 | |
|
you can watch television. |
许可 | |
|
You must stay at home. |
义务 |
The Second Conditional 条件句类型2
条件句类型2表示的是假设和现在事实相反，发生的可能性很小或者不会发生，并对其结果进行推断。
|
条件分句 |
主句（结果句） |
|
过去时 |
条件时态 |
|
If he lived in the country. |
He would feel much healthier. |
|
If I were learning Chinese, |
I’d go and live in China. |
|
If you left early, |
There’d be less traffic. |
|
If I lost my job, |
I would sell my house. |
Formation of the Past Conditional 对过去进行推测的条件时态的构成
肯定句
主语+would have +过去分词
（主语d’have + 过去分词）
否定句
主语+would not have +过去分词
（主语+wouldn’t have =过去分词）
疑问句
Would +主语++过去分词？
简短回答
Yes, +主语代词+would.
No, +主语代词+wouldn’t.
/would not.
The Third Conditional 条件句类型3
用法
条件句类型是假设和过去事实相反，对其结果进行推测。
If you’d told me you were unhappy, I’d have tried to help you. 如果你我你不幸福，我会尽力帮助你的。
做法
if 分句 主句
（过去完成时） （过去条件进态）
If he hadn’t lived in Dorking, he would have lived longer. 如果他没在多金住房过，他会住得更久。
If I’d known who he was, I wouldn’t have been so rude. 如果我知道他是谁，我不会这么鲁莽。
If you left earlier, there’d hav ebeen less traffic.如果你早点走，交通就不会那么拥堵。
If we hadn’t bought that vase, we’d have had enough money to go on holiday.
如果我们没有买那个花瓶，我们就会有足够的钱去度假。
其他形式
●条件分句里可以用过去完成进行时。
If it had been raining, I would have styed inside. 如果一直下雨，我宁愿待在家里。
If I’d been living in Paris, I would never have met you. 如果我一直住在法国，我就不会见到你。
●主句里除了用would 之外，还常用could或might.
If it had been raining, I could have stayed inside. 如果一直下雨，我可能就待在家里了。
If he hadn’t lived in Dorking, he might have lived longer. 如果他没在多金住过，他可能会住久一些。
●有时条件分句里没有if或unless,而主语和动词的位置是反过来的，这是非正式的说法。
Had it been raining, I could have stayed inside . 如果一直下雨，我会待在家里。
Had he not lived n Dorking, he might have lived longer.如果他没在多金住过，他也许就会住久一些。
