无铬碱性耐火砖 镁亚铁 铝尖晶石砖.docx

文档介绍：Grammar
虚拟语气
英语动词有三种语气:
陈述语气,祈使语气和虚拟语气
虚拟语气:表示说话人的所说的话不是事实,
一种假设、猜测、怀疑等(在条件从句中或让步状语从句中);
一种表示说话人的愿望、要求、命令、建议等(在宾语从句、表语从句、同位语从句)。
一:虚拟语气在条件状语从句中的用法.
条件句有真实条件句和非真实条件句两种。
真实条件句所表的假设是可能发生或实现的,是与事实相符的。
非真实条件句所表的假设则是不可能或不大可能发生或实现的, 与事实相反的情况。
If it is fine tomorrow, I will go to visit my grandma.
If I were a bird, I would fly to America.
动词形式
时间
从句
主句
与现在事实相反
动词过去式(be的过去式一般用were)
would
should + 动词原形
could
might
与过去事实相反
had +过去分词
would
should have+过去分词
could
might
与将来事实
可能相反
动词过去式/should +动词原形
were to+动词原形
would
should +动词原形
could
might
I would buy an expensive car.
I would buy a villa.
I would travel around the world.
If I won the lottery,
现在事实相反
Mark: 100
I ________
a party for you .
should get
If you
____________
____________
____________
got
Were to get
a full mark next time,
将来时相反
would hold
注意
if 的条件从句
当从句中有 were, had 或 should 时,可省略if ,
而把它们放在句首,再将句子的主语和谓语动词实行全部倒装或部分倒装。
If I were to meet him tomorrow, I should ask him about it.
Were I to meet him tomorro