set out,set up,set off,set about是什么意思？

set out,set up,set off,set about是什么意思？

这几个短语的意思都挺多的，但是高中阶段常见的意思主要有
set out　出发动身　set out on a trip
　　　　开始着手　set out to do
set up 建立，创立，设立
set off 出发动身　和set out 一样
　　　　使机器装置开动，启动
set about 开始着手　同set out但是注意用法，是set about set

set off: 出发,侧重于去某个地方 例句与用法: if you want to catch that train we'd better set off for the station immediately. 你要是想赶上那班火车，咱们就最好马上动身去火车站。 they've set off on a journey round the world. 他们已经开始环游世界. set out: 出发，开始，侧重于开始做某事，还有规划，展现的意思 例句与用法: they succeeded in what they set out to do. 他们打算做的事已经做成了. set about: 开始,着手，与set out意思相近，但set out后加不定式，即set out to do sth,而set about后加 ing形式，即set about doing sth. 例句与用法: 1. you must set about your work at once. 你必须立即开始工作。 2. do you know how to set about going on this work? 你知道怎样着手进行这项工作吗？