we are going to build a bigger bridge in five years为什用in five years不用after five years

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wearegoingtobuildabiggerbridgeinfiveyears为什用infiveyears不用afterfiveyearswearegoingtobuildabiggerbridg

we are going to build a bigger bridge in five years为什用in five years不用after five years
we are going to build a bigger bridge in five years为什用in five years不用after five years

we are going to build a bigger bridge in five years为什用in five years不用after five years
in 在这里表示的是未来的时间,“五年之内”
after表示五年之后

语法上都对，意思不一样。
前者是“5年之内”，后者是“在5年后”

in five years意思是在五年之内，因为建筑不能确定准确的时间，不一定是五年后，所以用in不用after

“in”表示五年内我们将一座更大的桥。
“after”表示五年后，这俩意思差距很大

in表示在五年之内，而after表示五年之后

进行时态有表将来的作用，in后面加时间表将来，而after加时间一般与过去时态连用

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