He heard the alarm go off.

　　他聽見警報響了。

　　The alarm did go off but all I did was yawn, turn over and go back to sleep.

　　鬧鐘確實響了，但我只是打了個哈欠，翻個身又接著睡著了。

　　Boys at that age should be able to explore and go off on their own, go on bike rides, get into mischief

　　那個年齡的男孩應該可以自己出去闖，也可以騎車出游，還可以調皮搗蛋。

　　He had never been afraid of failure: he was a gambler, ready to go off somewhere else and start all over again.

　　他從來都不害怕失敗：他是個冒險家，隨時準備到別處從頭再來。

　　He pulled the trigger but the gun didn't go off.

　　他打了一槍，沒有發火。