虚拟语气
（一）虚拟语气知识点讲解
虚拟语气与情态动词
1. if引导的虚拟语气
假设类型 if 从句谓语v 主句谓语v
与现在事实相反 动词用过去式（be用were） would
should
could
might
与过去事实相反 Had+done would
should
could
might
与将来事实相反 were to +do
should +do would
should
could
might
（1） 省略if的虚拟倒装
had + 主语（not）done
should + 主语 + do
were +主语+ to do
（2）含蓄虚拟
without = but for
with
（3）错综（混合）虚拟
2. 其他形式虚拟
(1）wish / wished
主
（2）as if / as though
主
3）if only
主
（4）would rather = ’d rather
主
would rather do / not do
(5)用表示建议、命令、要求等词引导的名词性从句中
that + 主语
两步解题方法：
①圈出标志词（表建议、命令、要求的词）
② 选出动词原形
suggest/-ed/-ion propose/-d/-sal order/-ed
ask/-ed require/-d/-ment request/-ed
desire/-d/-rable demand/-ed command/-ed
insist/-ed/-ent/-ence recommend/-ed/-ation
move/motion urge/-ent direct/-ed
advise/-ce/-able important vital
essential necessary imperative
（6）It's/was + time
high time + that +主+ did
about time
（7）lest (that)
for fear that + 主语 + should + do
(in case)
in case
（8）跳层虚拟
真实，otherwise / or + 虚拟
虚拟，but + 真实
真实—过去时 / must have done
虚拟—would / could + have done
3. 情态动词+ have done
must + have done
can / could + have done
may / might + have done
should / ought to + have done
shouldn't / oughtn't to + have done
needn't + have done
must
表命令 “必须”
表推测 “一定”
need
情态动词 “必要” + do
实义动词 “需要” + to do
need doing = need to be done
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