Set in: to be fixed and unable to change/to place something so that it is surrounded by a medium
固定，不能改变/放置某物使其被介质包围

He is set in his ways. He will never change./Can you set that statue in the cement before it dries?
他固执己见。他永远不会变。/你能在那雕像干之前把它放在水泥里吗？

Set on: to have expectations that something will happen/to place something on a specific location
开始：对某事将要发生/把某事放在一个特定的地点

My daughter was set on going to the beach, but the weather was bad that day./Can you set that flowerpot on the steps?
我女儿本来打算去海滩的，但那天天气不好。/你能把花盆放在台阶上吗？

Set up: to put together
装配：组装

After opening all of the presents during Christmas, they set up the train set.
圣诞节期间，他们把所有的礼物都打开后，就开始布置火车了。

Set out: to have as a goal
出发：以有为目标

The team set out to increase profits by 50%.
这个团队打算把利润增加50%。

Set off: to start a journey with a goal in mind
带着目标出发

They set off the day wanting to eliminate all of the trash on the beach.
他们一天出发就想清除海滩上所有的垃圾。