againandagain用什么时态

again and again用一般现在时和一般过去时态。

again and again 反复地、屡次的、一再地

They keep making the same mistake again and again.

他们一再地犯同样的错误。

The police asked us again and again to describe exactly what happened.

警方一再地要求我们描述（当时）确切发生了什么。