我必须为我的行为向伊索贝尔道歉。

I must ___apologise to Isobel for my behaviour.

火车可能会延误——我们对造成的不便表示歉意。

Trains may be subject to delay - we ___apologise for any inconvenience caused.

她为不得不提前离开而道歉。

She ___apologised for having to leave early.