The other two you know are stuff you can add, and you know where you're adding those things, because the particle has a head start.

另外两项是可加可不加的,而且你也知道这两项是怎么来的,因为质点运动是有起点的

耶鲁公开课 - 基础物理课程节选

You should ask someone else as I have no idea!

你应该问问别人，我可不知道。

Where 实战 - SpeakingMax英语口语达人

I wonder if I could use the restroom.

我想知道我可不可以用这个洗手间。

I wonder if 课堂 - SpeakingMax英语口语达人