有关set out和set off

有关set out和set off
1.他们有什么不同吗?
2.他们是延续性V.词组
还是非延续性V.词组啊?
3.可以和leave换吗?

set out: [ .set aut ] 出发
v. 规划,展现
v. 出发,开始
例句与用法:
1. She set out to break the world land speed record.
她决心要打破陆上速度的世界纪录

2. We'll need to set out chairs for the meeting.
我们要为会议摆好椅子.

3. She set out the pieces on the chess-board.
她把国际象棋的棋子摆在棋盘上了.

4. Her work is always very well set out.
她的工作总是很有条理.

5. They succeeded in what they set out to do.
他们打算做的事已经做成了.

6. They set out on the last stage of their journey.
他们开始了旅行的最后一程.

7. She set out at dawn.
她天一亮就动身了.

8. She set out the reasons for her resignation in a long letter.
她在一封长信里阐明了辞职原因.

set off: [ .set 'ɔf ] 出发
例句与用法:
1. 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.

2. That jumper sets off the blue of her eyes.
在这件毛衣衬托下, 她眼睛的蓝色显得更漂亮了.

3. They've set off on a journey round the world.
他们已经开始环游世界.

4. Do be careful with those fireworks; the slightest spark could set them off.
这些烟火要格外小心, 稍有火星就能引起爆炸.

5. Don't set him off talking politics or he'll go on all evening.
可别让他谈起政治来, 要不然他一谈就得一个晚上.

6. Her imitations always set me off (laughing).
她模仿别人的动作, 每次都把我逗得哈哈大笑.

7. What time are you planning to set off tomorrow?
你打算明天几点钟启程?

8. Panic on the stock market set off a wave of selling.
股票市场上人心惶惶, 掀起抛售浪潮