我想问一下,They went to beijing in 2000.They （come）back in twenty years.they后面填什么.为什么in加上2000就是过去时.那么in加上时间段是什么样的?那其他的介词加上年又是什么时态?

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我想问一下,They went to beijing in 2000.They （come）back in twenty years.they后面填什么.为什么in加上2000就是过去时.那么in加上时间段是什么样的?那其他的介词加上年又是什么时态?
我想问一下,They went to beijing in 2000.They （come）back in twenty years.they后面填什么.
为什么in加上2000就是过去时.那么in加上时间段是什么样的?那其他的介词加上年又是什么时态?

我想问一下,They went to beijing in 2000.They （come）back in twenty years.they后面填什么.为什么in加上2000就是过去时.那么in加上时间段是什么样的?那其他的介词加上年又是什么时态?
后面的come要填will come或are coming.因为in twenty years意思是“在二十年后”,是表示将来的时间.（in如果接了一段时间,则它表示的是将来的一段时间.）
in 2000表示”在2000年“,这是一个过去的时间.
on+具体的一天.如：on Monday在星期一,on the moring of June 1st在六月一号的上午.
in+大于一天的时间.如：in May在五月.
at+具体的某一时刻.如：at 8:00.
如还有不明白的,请继续追问!

they 后填 will come 。因为2000年已经过了，那么in 2000表示的是过去的时间，故用过去式。in +一段时间，常用在将来时态中，意思为“.....之后”by +年份，指的是到某一年为至。

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