get on
1.穿上(衣服等)；戴上(帽子等)；盖上(盖子等)：
例句：Get on your rubbers,we have to go out in the rain.穿上你的胶鞋，我们必须在雨天外出。
I can't get the lid on,the box is too full.我盖不上盖子，箱子太满了。
2.开(灯、开关等)；放上；安上：
例句：Get some more wood on,the fire is dying.再添些木柴，火要熄灭了。
3.(使)登上公共汽车(或火车等)；(使)骑上自行车(或马等)：
例句：Before you can learn to ride a horse,you have to be able get on it.你要学会骑马，必须先会上马。
4.继续做，进行下去：例句：Don't let me stop you,do get on!别让我打断你工作，继续干吧！
5.[口语]快点，赶紧做：例句：Get on,we shall miss the plane at this rate.快点吧，照这样的速度我们要误飞机了。
6.(时间)晚，不早；(人)变衰老，上年纪；快要，接近：例句：It's getting on for midnight,let's go to bed.快到半夜了，我们睡觉吧。
7.(使)取得进步，(使)获得进展，(使)有起色：例句：John watched every opportunity because he wanted to get on.约翰盯住每一个机会,因为他想获得成功。
8.(和…)相处和睦，友好：例句：They get on well at work but not privately.他们工作上相处融洽，但私交不怎么样。
9.过下去,对付过去：例句：We can't get on without their help.没有他们的帮助，我们没法过下去。
10.去你的；我不相信[用作感叹语,表示怀疑、吃惊]：例句：Get on!He never said that!去你的！他从来没有说过那话！
11.出人头地；发迹：例句：to get on in life 有出息。
get in
1.(使)进来(或进去)；(使)进入：例句：He invited us to get in the car and go for a ride with him.他邀请我们坐进轿车和他一起去兜风。
2.进屋，带进屋；拿进屋：例句：Help me to get the washing in,it's raining.帮我把洗晒的衣服拿进屋，天在下雨了。
3.到达，来到；进站：例句：What time does the train from London get in?从伦敦来的那列火车什么时间进站？
4.(不受欢迎的东西)渗入，侵入，弥漫：例句：We must mend the roof,the rain is getting in.我们一定要修理屋顶，雨水渗进来了。
5.收集,收割；进(货)；收(税、账等)：例句:He will have to get in more money.他将不得不收更多的钱。
6.插入(讲话)：例句：She spoke so fast that I couldn't get a word in.她讲话太快，我一句话也插不进去。
7.购买(生活用品等)，储存：例句：We should get some wine in for the banquet.我们应买一些酒以备宴会用。
8.请…来帮忙；通知…来(做)：例句：They have got the doctor in to look at the child.他们请医生来给孩子看病。
9.播下(种子)，种植，把…种下：例句：He has got his seeds in already.他已经播种了。
10.送到，交付：例句：Did you get the papers in by the right date?你是否如期送交文件了？
11.[口语]参加，加入(常与at、on连用)：例句：Alice is always wanting to get in on the act.艾丽丝总是想参加这项活动。
12.(经考试、测验后)被接受入学；被接受参加竞赛：例句：He got in after a special test.经过一次特殊测试后，他被接受入学。
13.(使)当选：例句：He got in at his first election.他初次竞选就当选了.
14.把…列入，把…安排进：例句：I'm hoping to get in two hour's study before going to bed.我希望在睡前安排两个小时的学习。
get out of
1.逃避 ：例句：I couldn't get out of going to that wedding.我不能逃避出席婚礼。
2.弃绝 ：例句：He got out of the bad habit.他改掉了这个坏习惯。
3.使说出 ：例句：The police got the truth out of him.警察迫使他说出真相。
4.从.....出来：例句：He got out of the taxi.他从计程车中出来。
get off
1.动身：例句：They got off immediately after lunch.他们吃过午饭马上就动身了。
2.免于受罚：例句：The boy got off.这孩子没有受罚。
3.脱掉：例句：Take off your shoes,please.请脱掉你的鞋。
4.下车：例句：They got off the bus.他们下了公共汽车。
而get in和get ou of 指上下小型交通工具，像小汽车、的士等。
望采纳。本回答被网友采纳
get into/out of 指的是上/下小汽车，因为空间较小，所以实际是钻进去的本回答被提问者采纳
get into进入...例如：get into the buidling进入大楼
get off：下去 例如：下车get off
get out of：脱离 例如：get out of trouble/stress远离麻烦/压力