unless
unlessconj.除非;若非;如果不。它是个从属连词,引导条件状语从句。由于unless具有否定意义,因此它引导的是个否定的条件。在中学阶段可以把它看作是if...not的同义表达。值得注意的是,unless从句如同if从句一样也常用一般现在时态表将来。如:
Unlessheworkshard,hewillnotpassthefinalexams.
=Ifhedoesntworkhard,hewillnotpassthefinalexams.
要是他不努力的话,期末考试将会不及格。
Illnotgotoherbirthdaypartyunlesssheinvitesmeinperson.
=Illnotgotoherbirthdaypartyifshedoesntinvitemeinperson.
我不会去参加她的生日晚会,除非她亲自邀请我。
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