if at any point you've got something you want to ask about or some two bits you want to add, raise your hand, wiggle it around, make sure I see you.

任何时刻如果你有想问的东西,或者你想要加上什么东西，请举手，摇晃起来，确保我能看见。

耶鲁公开课 - 死亡课程节选

I saw you sitting on the step and writing something. What were you doing?

我看见你坐在台阶上写什么。你在干什么呢？

沟通很重要 - SpeakingMax英语口语达人