单词的区别 unless ,if ,as long as 的区别

1。unless 表示“如果不；除非”,多引导一个否定意义的真实条件句,有时也可引导非真实条件句。在意义上相当于if。。。not。Unless he apologizes to me,I won't talk to him。除非他跟我道歉,否则我是不会跟他说话的。注意：unless 放句首时,主句是不用倒装的。2。as long as “只要。”,引导条件状语从句,从句多用现在时,主句多为将来时,主句用正常语序。如：As long as you lend me the book,I will do whatever you want me to do。只要你借给我这本书,你让我做什么都可以。3。if 表条件,如果