—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.

—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.
—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.

—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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