This is great when you want to express regret for something that you perhaps did not do.

当你想表达对一些过去没做成的事情感到后悔时，你可以使用这个句型。

I should have 课堂 - SpeakingMax英语口语达人

You can be very indirect and just express what you'd rather do instead.

你可以非常间接地表达你宁愿做其他一些事情。

I'd rather 课堂 - SpeakingMax英语口语达人