"Would rather" 是一个情态动词短语，用于表达偏好或愿望，并且它后面通常跟虚拟语气。虚拟语气的使用取决于所表达的时间框架和情境。以下是 "would rather" 后接虚拟语气的几种常见用法：
一般过去时：
用于表达现在或将来的愿望或偏好。例如：
I would rather stay at home than go out in this weather.
She would rather read a book than watch TV.
过去完成时：
用于表达对过去情况的虚拟。例如：
I would rather have finished my homework by now.
They would rather have arrived earlier.
"would rather" + 动词原形：
这种结构不常见，通常用于表达现在的愿望或偏好，而不是对过去的虚拟。例如：
I would rather you called me yesterday.
"would rather" + "than"：
用于表达选择关系，即宁愿做某事而不愿做另一事。这个结构中的 "than" 后面通常跟动词原形。例如：
I would rather play football than stay at home all day.
在使用 "would rather" 时，需要注意其后的虚拟语气结构，以确保句子表达的是正确的虚拟意义。