unless
与
if…not…
同与异
1.
当所述条件会结束已经存在的想法或状态时,用或都可以。如:
We shall go unless it rains tomorrow. =We shall go if it doesn’t rain tomorrow. 如果明天不下雨,我们就去。(“下雨”会结束“去”这一已经存在的趋向)
You will be late unless you start at once. =You’ll be late if you don’t start at once. 如果不马上走你就要迟到。(“马上走”会结束“迟到”这一趋向) http://yingyu.chazidian.com
2.
当所述条件会导致一种新的想法或情况时,通常用if…,而不用unless。如:
I’ll be angry if I’m not invited to the party. 如果不邀请我参加聚会我会生气的。(“不邀请”就会导致“生气”这种新情况)
3.
表示虚拟条件只能用if…not,不用unless。如:
He would have died if the doctor had not saved him in time. 要是医生不及时救了他,他早就死了。
4.
若需定再与否定连用,用unless,不用if…not。如(http://yingyu.chazidian.com):
译:如果没有别的人去,我就去。
正:I will go unless no one else does.
误:I will go if no one else doesn’t.
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