特殊情态动词
除了上述的基本情态动词之外，还有一些如would rather, would sooner, would (just) as soon, had rather, had better, had sooner, can not but, may (just) as well等可用作情态动词。
The soldier would sooner die than surrender. 这个战士宁死不降。
If you don’t like to swim, you may just as well stay at home. 如果你不喜欢游泳，你也可以待在家里啊。
这些短语后一般直接跟动词原形。但是当would (had) rather, would (had) sooner, would (just) as soon后可跟that 引导的从句时，从句就要用虚拟语气。对现在和将来的假设用过去时，对过去的假设用过去完成时。例如：
I would rather you went home right now.我倒宁愿你现在立刻回家去。
I would sooner you hadn’t asked me to speak yesterday. 我倒宁愿你昨天没邀请我讲话。