condition

You must on no condition tell them what happened.

你绝不能告诉他们发生了什么事。

They agreed to lend us the car on condition that we returned it before the weekend.

他们同意把车借给我们，条件是我们必须在周末前归还。

I would consider studying abroad, on the condition that I get a scholarship.

倘若获得奖学金，我会考虑出国学习。