This is the first time we (have seen) a film in the ciname together as a family 为什么用have seen

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• 麻烦好心人总结下定语从句time后用when引导的情况这几份资料把我弄糊涂了①当先行词为 by the time ,any time ,the way,every time,the first time ,the last time 时,关系词不用when而用that.或省略,但如果time前无修饰语,关系词用that when 均可②在定语从句中,time 有很多意思比如:I miss the time when we were together.It's the second time that I have seen the picture.第一句中time表示"时间,时候",第二句time就表示"次"③when引导定语从句表示时间[注]值得一提的是,表示时间“time"一词的定语从句只用when引导,有时不用任何关系代词,当然也不用that引导.By the time when you arrived in London,we had stayed there for two weeks.
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• This is the first time we (have seen) a film in the ciname together as a family 为什么用have seen
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