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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:
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