He was caught in the act of stealing a car.

他偷汽车时被当场逮个正着。

The men were caught in the act of digging up buried explosives.

这些人在挖掩埋起来的炸药时被逮了个正着。

Ken was in the act of paying his bill when Neil came up behind him.

当尼尔走到他身后时，肯正在付账单。

He was nabbed in the act of stealing.

他偷东西时当场被捉住了。

The thief was detected in the act of stealing.

那小偷正在行窃时被当场发现。