妈妈经常会跟孩子们说“表现好点！”，“乖乖的哦”，这句话用英语怎么说？

1.behave: to do what people tell you and not cause any trouble - use this especially about children

备注：''behave''常用于口语中。

例：

If you two don't behave, I'm taking you straight home. （如果你们俩不给我乖乖的，我就马上带你们回家！）

behave yourself (=behave well)

Make sure you behave yourselves when we visit Grandma. （在奶奶家的时候，你们一定要乖乖的！）

2.well-behaved: someone who is well-behaved does not cause any trouble and does what other people tell them to do - use this especially about children, pets, or large groups of people

例：

Can I bring my dog? She's very well-behaved. （我能带我的狗狗来吗？她很乖的。）

a well-behaved child（很乖的小孩）

The crowd was noisy but well-behaved. （这群人虽吵，但是很有秩序不惹事。）

近义词：

well-brought up: a child or young adult who is well-brought up always behaves well because their parents have taught them to be polite

例：

They are well-brought-up children, and have a great respect for their teachers. （他们都是很有教养的乖孩子，很尊敬老师。）

3.good: if a child is good , he or she does not cause trouble and does what he or she is told to do

例：

I was always very good at school. （我在学校向来表现很好。）

He's a good little boy. （这个小男孩很乖。）

be good! (=used to tell a child to behave well)

Bye now, Jessie. Be good. （杰西，再见，乖乖的哦。）

4.be on your best behaviour: to make a special effort to behave well by doing and saying the right things and being very polite, because you know other people are watching you

备注：英式英语中写作''be on your best behaviour''，美式英语中写作''be on your best behavior''。

例：

Dinner was very formal, with everyone on their best behavior. （那是个正式的晚宴，大家都尽力让自己举止得体。）

The children were all on their best behavior at the museum. （参观博物馆的时候，孩子们都表现得很好。）

《老爸老妈浪漫史》S01E15对话：

情境：Ted的新女友Victoria要来跟Ted的朋友们一起玩，在Victoria到来之前，Ted嘱咐大家一些“注意事项”。

Ted: Okay, I wanna lay down some ground rules for tonight. Barney, I actually like Victoria... a lot, so don't say anything embarrass... Don't say anything. And guys, I haven't exactly told Victoria that I used to have a kind of thing for Robin, so if we could just avoid the...

Barney: Well, well, well. How rich. You make me promise to be on my best behavior around your girlfriend, yet, you have been lying to her since day one.

大意：

Ted：听我说，今晚我先定几个规矩。Barney，我非常非常喜欢Victoria，所以别讲什么难听的……干脆别讲话得了。还有你们，我没告诉Victoria我以前喜欢Robin，所以尽量不要提到……

Barney：哼哼，想得美。你让我答应要在你女朋友面前表现得体，但是你自己却从第一天开始就对她撒谎。

5.stay out of trouble: to try not to behave badly, especially because you do not want to be noticed or caught

例：

Have a good time, boys, but try to stay out of trouble. （孩子们，好好玩啊，乖乖的啊，别惹祸！）

If I stay out of trouble till June, my parents will take me to Florida. （如果我一直好好表现，6月份我爸妈就会带我去佛罗里达。）