妈妈不让西蒙出去，除非他答应今晚十点前回来。

Mum won't let Simon go out unless he promises to be back before 10 o'clock tonight.

youdao

你必须在十点前回来。

You must come back by 10 o? Clock.

youdao

十点钟前一定要回来，否则你将被关在门外。

Be back before ten, or you'll be locked out.

youdao

十点钟前一定要回来，否则你将被关在门外。

Be back before ten, or you'll be locked out.

youdao