十二. 状语从句
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73．I will go unless he invites me.
此句意为“除非他邀请我，否则我不去。”而unless相当于if not, 所以本句应改成：I won’t go unless he invites me。
74．Although he tried, but he still couldn’t keep up with the others.
although 和but 不能同时用在一句话中，去掉任何一个都可以。
75．I won’t stay until he comes back.
含有not…until的句子的谓语动词应是点动词，含有until的肯定句的动词应是延续性动词，此句有两种改法：I will stay until he comes back.或I won’t leave until he comes back.
