高二英语Module6 Unit3 Grammar and usage虚拟语气课件

课件22张PPT。Grammar and usageUnreal conditionals
虚拟语气中的非真实条件句虚拟语气可用于条件句和其它一些从句中。虚拟语气用于条件句中比较多, 情况也比较复杂, 所以要特别加以注意, 首先要判断一下是否应该用虚拟语气, 因为条件句分为两种, 一种是真实条件句, 一虚拟语气的介绍种是非真实条件句, 只有在非真实条件句中才用虚拟语气, 在真实条件句中, 要用陈述语气。非真实条件句的时态表达如果假设的情况完全不存在或者实现的可能性很小,可以说几乎没有时,就需要用虚拟语气来表达,也就是说,这时的条件句是非真实的条件句。此时的句子时态比真实条件句中的时态后退一步。If …were/was/did …, …would/could/might do…If I were you, I should/would go at once.
If I got the chance, I would want to be a lawyer.与现在事实相反的条件句注意:在if I /he/she/it 之后, 可用were代替was。两者在意义上没有区别, 但是were更为正式, 特别是在称述心存怀疑的事情时:
If she were ready, we would go.If…hadbeen/done…, …would/could / might have done If you had been there last night, nothing would have happened.
If she had got up earlier, she would have caught the bus.与过去事实相反的条件句If…was/were/did…, …would/could/might doIf it were Sunday tomorrow, we wouldn’t have an exam.
If I had time tomorrow, I would certainly go to help you.与将来事实相反的条件句在与将来事实相反的条件从句中,用were to或should +do来表示,如:
If I were to fail my English test, I would have to take it again at the end of the term.注意:If he should come tomorrow, I would talk to him about it.PracticeRead the dialogue at page 40 and fill in each blank with the correct form of the verb in brackets.在非真实条件句中,如果有were, had, should, 我们可以将if省略,把这些词置于句首,采用倒装形式,如:虚拟条件句中的省略与倒装If I should meet her, I would tell her.
= Should I meet her, I would tell her.
If I were in your position, I would do it better. = Were I in your position, I would do it better.
If they had made preparations, they would have succeeded.
=Had they made preparations, they would have succeeded.有时非真实条件句中, 主句谓语动词所表示的动作和条件从句中谓语动词所表示的动作并不同时发生, 这时动词的形式并不完全按照上述表格来进行, 而需要按照各自的时间来调整, 这样的句子就叫错综时间条件句。错综时间条件句如:
If you had followed the doctor’s advice, then you would be all right now.
If I hadn’t finished my composition by now, I would be working on it tomorrow.If he had prepared well for his lessons yesterday, he wouldn’t have so many difficulties now.有时一个假设的情况并不用条件从句表示,而用其它方式来表示,这样的句子叫含蓄条件句。用with, without等介词短语或分词短语或者独立主格结构来代替条件从句。含蓄条件句We might have died without your help.
=We might have died if you hadn’t
helped us.
Having known in time, we could have
stopped it.
= If we had known in time, we could
stopped it.在条件从句中除最常见的连词之外,尚有下列连词:otherwise; in case; but that; on condition that; unless; suppose/supposing (that); so long as; provided/providing (that)2. 用相当于if的其他连词表示虚拟结构I was busy last week, otherwise I would have come to see you.
But that you had offered help, they couldn’t have finished their work on time.I would have given you more money, but I was poor then.
I would have called you, but I forgot your telephone number.3. 通过上下文来虚拟Do the exercise at page 41.
Finish the exercises at page118,C1 and C2More practice