英语动词时态问题1． There (be) _ have been__ several such occurrences

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英语动词时态问题
1． There (be) _ have been__ several such occurrences in the past few weeks.
在过去的几个星期,发生了几宗事故.为什么不用had been ,不是说在过去的几个星期吗?
2． We are going to Florida as soon as we (finish) _finish_____ taking our final exams.
为什么用 finish 是因为 be going to do
3． A lot of people were standing around when the police (arrive) _arrived___________.
根据主句’ were standing around’,状语从句不应该用 was arriving
1、3都可以理解了,2还是不太明白,是否理解为因为'be going to'表将来,所以从句用一般现在时来表将来时？

1、这里说的是在过去的几个星期,所以用现在完成时,在过去的过去才用过去完成时
2、这里和be going to do 结构没有关系,这句话的意思是只要我们已完成我们的期末考试我们就去佛洛雷达
3、这句话的意思是说当警察到的时候很多人都站在周围,这里主要是考的when引导的时间状语从句,前面用的过去进行时,后面则用过去式

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