Can you suggest another time _______ we can go out for a wal

in another time 下一次
Can you suggest another time in which we can go out for a walk =Can you suggest another timewhich we can go out for a walk in
we can go out for a walk是定语从句用来限定another time 的,因为从句中缺介词in的介宾,所以需要引导从句的关系代词.当先行词是物时,用that 或which,但that不能用于借此之后.

in which=where 这里是一个表语从句，where或者in which引导后半句的地点状语

因为这个定语从句原本是有介词in的，但是由于它做了从句，所以in就放在了引导词which的前面