省略if时,谓语提前问题

省略if时,谓语提前问题

1、虚拟语气中，if省略时，从句谓语中的were,should,had提前，用成倒装结构。
如果从句中是were to，were仍然可以提前。例如：
Were it to rain tomorrow,I would not go swimming.
=If it ere to rain,I would not go swimming.
2、将来虚拟，从句可以用别的替代should吗？
将来虚拟，从句习惯使用【should do,were to do】,而很少使用would,could,might（这些主要用于主句）。
祝你开心如意！

1. 当虚拟条件句的谓语动词含有 were, should, had 时，if 可省略，而将 were, should, had等词置于句首。如：
Should he agree to go there, we would send him there. 要是他答应去的话，我们就派他去。
Were she here, she would agree with us. 如果她在这儿的话，她会同意我们的。
Had he learnt about computers, we would have hired him to work here. 如果她懂一些电脑知识的话，我们会已经聘用他来这里工作了
2.
请看下面的题目：
If we __________ 200 years old，we __________everything.
A.were to be，could change
B.had been，changed
C.were，would have changed
D.should be，changed
此题应选A。该题考查与将来事实相反的虚拟语气，此时的主句谓语通常用
would(should，could，might)＋动词原形，而从句谓语可能有以下几种情况：
从句谓语用过去式：If your father knew this，he would be angry.
要是你父亲知道了，他会生气的。
If it rained tomorrow，the sports meet would be put off.
要是明天下雨，运动会就推迟。
从句谓语用should+动词原形(通常指可能性极小的事情，一般译为“万一”)：
If it should rain，the crops would be saved.
要是有雨，这庄稼还有救。
此类句型的主句谓语有时可以用祈使句甚至将来时态：
If it should rain tomorrow，don’t expect me.
万一明天下雨，就不要等我了。
If I should be free tomorrow，I will come.
万一我明天有空，我就来。

从句谓语用were to+动词原形(通常指可能性极小可或近乎不可能，有时指出乎意料)：
If the sun were to rise in the west，my love for you would not change.
即使太阳从西边出，我对你的爱也不会变。

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