注:
①虚拟条件从句中,如谓语中有were , had, should等词,有时可把这些词放到主语前,并省略连词if。如上面中的第一句 和中的第二句 可分别改为下列形式而意思不变:
Had you started your work earlier, you would have finished it.
Should I live in the twenty-second century, I would spend my vacation on the moon.
②虚拟条件除用从句表示外,还可以通过介词短语等来表示,这时句中动词也用虚拟语气。如:
Without dust, there would be no clouds and no rain.
没有灰尘,不会有云,也不会有雨。
But for your cooperation, my business would have collapsed.
要不是你的合作,我经营的企业早就垮了。
l 虚拟语气的一些其他用法
1.在表示愿望、建议、要求、命令等含义的动词及其派生的同根名词后面的主语从句、表语从句及同位语从句中的谓语一般用虚拟语气,即should +动词原形或只用动词原形。这类从句常见的动词有:demand, desire, request, require, propose, suggest, recommend, move , order, command, insist等。如:
e.g. It is required that the equipment should be tested again before it is actually put into operation.
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