in 和 at一定要固定用吗？

Question

如题所述

Answer 1

如果你问题的意思是它们相连出现在句子中算不算错，答案是不一定。它们有时可相
连出现在句子中。见下例:
但一般表示方位时，这两个介词不能同时用。I've booked you in at the Grand Hotel.
我已经在格兰大饭店为你预定了房间。Do you have any fresh salmon in at the moment?
现在有新鲜大马哈鱼卖吗？School takes in at eight and lets out at three.
学校八点上课，下午三点放学。Robbers often breaks in at midnight.
强盗经常在半夜破门而入。He weighed in at several pounds below the limit.
他赛前量体重比规定限度少几磅。The soldiers will rush in at the officer's command.
军官一下命令士兵们就会冲进来。A soft breeze set in at midnight.
午夜时吹来一阵和风。

Answer 2

大多是in＋大地点，at＋小地点。但有时根据句子的成分两者都可以。

Answer 3

看句子的应用。