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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 doesnt 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. =Youll be late if you dont 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)
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:
Ill be angry if Im 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ifnot,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ifnot。如
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 doesnt.
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