I'll leave you alone

先───before;不───no

Never before had he felt himself so powerfully attracted to the idea.───他从没有像现在这样热衷于这个想法.

You must hand over your passport before you leave.───离境前必须交回护照.

She had no head for business, and it was not long before she went under.───她没有做生意的头脑, 不久就失败了.

A vast expanse of golden crops lay before us.───我们眼前展现出一大片金黄色的庄稼.

Look before you leap.───三思而后行.

Jim appeared a few minutes before the end of the party.───吉姆在晚会结束前几分钟才露面.

Don't forget to shake the pockets out before you take your coat to the cleaner's.───你把外衣送到洗衣店之前,别忘记抖空衣兜.

One way and another I'm going to finish this work before the end of the month.───无论如何,我打算在本月完成这项工作.