And this should look kind of familiar to some of the problems you may have seen on the problem-set if you started it this weekend.

如果你们这周就开始做习题集的话,这样的题目你们,应该会觉得很熟悉。

麻省理工公开课 - 化学原理课程节选

I should have started writing this paper a long time ago.

我早该开始写这篇论文。

How can I 实战 - SpeakingMax英语口语达人