495　not…without

◎ not…without是一种双重否定结构，表示的是肯定含义，意为“没有……不，只有……才”，也可以用never…without。

Man can't live without food. 人没有食物不能活。

They can't finish the work on time without your help. 没有你的帮助，他们就不能按时完成工作。

Don't enter the room without knocking at the door. 不敲门勿进房间。

She never speaks English without making mistakes. 她一说英语就出错。

I never see the picture without thinking of her. 我看见这幅画就会想起她。

There is no smoke without fire. 有烟就有火。