4 、词组 but for 相当于 were it not for 或 had it not been for, 表示一种含否定意义的条件,后面一般加名词或名词短语,如: He might have been killed but for the arrival of the police .要不是警察来了他本可能被杀死。
5 、在某些表示祝愿的句子里需要用虚拟语气,如: May you be happy all your life!
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