leave的意思和用法

leave的意思和用法
我看到有的是-离开,有的是-留下的意思,到底是什么呢?有什么+FOR,什么的能都给我讲讲吧!
基本都是复制阿，但我还是不懂啊，

leave1
及物动词 vt.
1.离开(某处)[(+for)]
Mr.Smith left the room at two o'clock.
史密斯先生两点离开房间.
2.离开(某人)的身边;遗弃,离弃
Her husband has left her.
她的丈夫把她遗弃了.
3.辞去(工作等);脱离(组织等)
Mary left school last year and she is working in a shop now.
玛丽去年退了学,现正在一家商店工作.
4.遗忘;丢下
I left my keys behind.
我忘了带钥匙了.
5.听任,使处于某种状态[O4][O7][O8]
He left the windows open.
他让窗子开着.
6.留给[O1]
He left me a few books.
他留给我几本书.
7.把...交给;委托[(+with/to)][+v-ing][O2]
You can leave your case with me.
你可以把箱子交给我.
8.死后留下(家人等)
He left a wife and five children.
他死后留下妻子和五个孩子.
9.死后留下...给(某人)[O1]
Mother left me $10,000.
母亲去世,留给我一万美元.
10.剩下
I felt I had little energy left.
我感到我一点劲也没有了.
11.(从某个方位)经过
Leave the monument on the right and cross the bridge.
从右手经过纪念碑,再往前过桥.
不及物动词 vi.
1.离去;动身[(+for)]
We will leave for London next week.
我们下周动身去伦敦.
leave2
名词 n.
1.准假;休假;休假期[C][U]
I got two weeks' leave.
我获得两周的假期.
2.许可,同意[U][+to-v]
Have you got leave to come here this afternoon?
你得到许可今天下午来这里吗?
3.离去,告别[U]
The guests took leave after thanking the host.
客人们对主人表示谢意之后告辞了.
to leave things about 东西随地乱放
to leave alone 不管
to leave behind 留下
to leave in 保留
to leave somebody in the dark不让某人知道
to leave off 停止
to leave room for 留下….的余地
to be on leave 正在度假期间
to ask for leave 请假
leave about乱扔
leave aside不考虑
leave for 动身去
leave go/hold of sth 松开
leave it at that（非正式用语）到此为止
leave no stone unturned 千方百计,想尽办法
leave off 停止,不用做、用、穿
leave off(doing) sth.停止某事,停止做某事
leave out 省去、遗漏、不考虑、离开
leave sb.in the lurch 抛弃（某人）与困境
leave sb.in the lurch 弃某人于危难之中
leave sb./sth.behind 忘记带,遗落
leave sb./sth.out 不包括
leave well alone维持原状