—How soon will Henry be back?—He said he would come after four o'clock.中为什么用after而不是in所以说，如果改为用in来表达，应该是He said he would come in four hours.

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—How soon will Henry be back?—He said he would come after four o'clock.中为什么用after而不是in
所以说，如果改为用in来表达，应该是He said he would come in four hours.

after 是在.之后
in 是在什么之内
如果用in的话 就是在四点内来
希望能够帮到楼主

after后+具体重点数和in + 小时数均可表示将来的时间。此句中four o'clock是具体的钟点数，而不是小时数，所以用after不用in
祝楼主更上一层楼

1.in 作为介词 一般是在什么里 在某地等存在意义，若是in four o'clock 就是在四点
问题是Henry 多久能回来 不是问具体几点能回来。
2.after是在什么之后的意思，用after，回答是：他说他会四点后回来，与问句“多久”这个词相符

after后加点时间，in后面加段时间。就这么简单。

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