虚拟语气 时态
题目
虚拟语气 时态
虚拟语气有哪些时态
答案
现在① 表示与现在事实相反的情况:
主语+should/would/could/might+do+其他+if+主语+did/be(were)+其他
例:
1.If I were you,I would take an umbrella.如果我是你,我会带把伞.(事实:我不可能是你)
2.If I knew his telephone number,I would tell you.如果我知道他的电话号码,我就会告诉你.(事实:不知道)
3.If there were no air or water,there would be no living things on the earth.如果没有水和空气,地球上就不会有生物.(事实:地球上既有空气也有水)
过去②表示与过去事实相反的情况
主语+should/would/could/might+have done+其他+if+主语+had done +其他
例:
1.If I had got there earlier,I should/could have met her.如果我早到那儿,我就会见到她.(事实:去晚了)
2.If he had taken my advice,he would not have made such a mistake.如果他听我的劝告的话,就不会犯这样的错误了.(事实:没有听我的话)
将来③表示对将来情况的主观推测(可能相反或可能性很小)
主语+should/would/could/might+do+其他+if+主语+did/should/were to do+其他
例:
1.If he would come here tomorrow,I should/would talk to him.如果他哪天来这儿的话,我就跟他谈谈.(事实:来的可能性很小)
2.If there were a heavy snow next Sunday,we would not go skating.如果下周日下大雪,我们就不能去滑冰了.(事实:不知能否下雪)
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总结:
现在① 表示与现在事实相反的情况:
If it did ..,I should do..
过去②表示与过去事实相反的情况
If it had done ..,I+should have done..
将来③表示对将来情况的主观推测(可能相反或可能性很小)
If it would do..I should/would do..
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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