条件句的用法课件-高考英语语法复习.pptx

《条件句的用法课件-高考英语语法复习.pptx》由会员分享，可在线阅读，更多相关《条件句的用法课件-高考英语语法复习.pptx（20页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、条件句条件句单击此处添加副标题姓名什么是条件句？条件句的构成是什么？为什么要用条件句？The if clause may come first or second.if从句可以在前面，也可以在后面。例如：The machine works better if you change the oil regularly.If prices are too high,demand is choked off.注意观察下列表格：我们可以总结出：The zero conditional is used to state things that seem generally or always true

2、such as rules,inevitable outcomes and consequences,mechanical workings,scientific and economic laws,political truths,religious doctrines,guidelines.例如：The solution clouds if you shake it.如果你摇晃它，就会变得浑浊它通常用于描述发生其他事情时不可避免的负面结果，可能带有其中一个否定从句:崩溃，罚款，惩罚，状态变化等例如：There is a charge of 50 if you are over a week

3、 late with your payment.The phone doesnt work if it isnt charged up.An error message is displayed if invalid information is entered.They face certain death if they are sent back to their home country.First conditional真实条件句的构成如下表：在第一个条件句中有两个从句。我们在if从句中使用一般现在时，在主句中使用will(或其他情态动词)。从句可以按任意一种顺序出现。当if从句在前

4、面时，我们使用逗号。例如：If I see him,FU pass on your message or Ptt pass on your message if I see him.If they change their minds,he might give them a refund or He might give them arefund if they change their minds.The present progressive can be used instead of the present simple.If Laura is coming to the party

5、,Marco will be really happy.真实条件句的用法：The first conditional is used to talk about things that are normal,possible and quite likely to happen.It is typically used to.例如：give warnings and advice.给出警告与建议If you pick it up when its hot,youll burn your fingers.make predictions;speculate about future events

6、.做出预测If it works,well make a lot of money.threaten.威胁If you dont leave right now,Ill.make offers,promises;barter.提出提议、承诺;物物交换。If you lend me the football,Ill lend you my Scrabble set.discuss hypotheses;offer theories.讨论假设;提供理论。If the lever moves clockwise,I think the gate will open.draw conclusions

7、from evidence.从证据中得出结论。If they are all here,then there is nobody at Reception.state instructions.状态指示If you press button C,the machine will switch off.Second conditional非真实条件句：例句：If I went to Moscow,Id buy you some caviar or Id buy you some caviar if I went to Moscow.If she believed you,shed cancel

8、the booking right now or Shed cancel the booking right now if she believed you.If aliens visited us tomorrow,itd prove your theory or Itd prove your theory if aliens visited us tomorrow.第二个条件句用于谈论不可能或正确的事情（非真实条件句）有可能但不太可能发生或几乎不可能发生。许多第二条件句可以继续，but Im not.(或类似的结局)。例句：If I went to Moscow,Id buy you so

9、me caviar(-but Im pretty sure Im not going,so tough!)If she believed you,shed cancel the booking right now(-but she doesnt,so she wont).If I were you,Id.If I were you,Id.This means that the speaker is imagining what it This means that the speaker is imagining what it wrould be like to be the other p

10、erson and what they wrould be like to be the other person and what they would do in his/her shoes.It is often used to give would do in his/her shoes.It is often used to give advice.advice.例如：例如：If I were you,Id dump him.If I were you,Id dump him.Third conditional虚拟条件句：This is sometimes called the pa

11、st conditional.例句：(注意句子之间的转换）If Id gone to Moscow,I could have bought you some caviar or I could have bought you some caviar if Id gone to Moscow.If youd eaten all that breakfast,you wouldnt have been able to climb this hill or You wouldnt have been able to climb this hill if youd eaten all that bre

12、akfast.If John had told me,Id have prepared for the meeting or Id have prepared for the meeting if John had told me.非真实条件句用于谈论过去发生的不可能发生的事件/改变了。说话者使用第三条件句是在推测如果某事以不同的方式发生或没有发生，事情可能会如何改变。因此，第三条件句尤其与遗憾有关例如：If I hadnt eaten so much at dinner,I wouldnt feel so sick now!.I wish and If only.用法：These are often used to say how we wish a past situation was different.There is often a strong element of regret.If only is frequently used without a second clause.例如：If only we could afford to buy a place of our own.Homework：复习各个条件句的用法整理各个条件的时态用法用其造句See you!单击此处添加副标题