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To arrange for an appointment with us, please complete the reply slip and sent it back to us. 上面这句话很好，很客气，但是第二分句的动词sent的时态不对，应该改为send，从过去简单时态变成现在简单时态，使两个等立分句中的动词时态一致。 在语法上，这叫做时态的一致（sequence of tenses）。下面是几个指导原则： Ⅰ 主句（main clause）里的动词是过去时态的话，名词从句（noun clause）或副词从句（adverb clause）里的动词也要以过去式出现，如： ● Tom said/ that he was busy yesterday. ● Janet wanted to know/ why she was not given a more important job. ● Lily failed/ because she did not submit the project report. ● None could help you/ if you continued being lazy. ● Although David was unwell,/ he went to office as usual. 这原则有两个例外，即： （i）当名词从句表达一种真理或既成事实时，其动词时态是现在式，如： ● Newton discovered/ that gravitation causes apples to fall. ● Our elders told us/ that experience is the best teacher. （ii）比较性的副词从句里的动词时态有伸缩性，视情况而定，不一定非过去式不可，如： | 
