start up . make a sudden movement due to surprise，alarm，pain，惊跳起来
A hare started up at his feet and raced off．有只兔子突然从他脚边一蹦就跑掉了。
He started up from his seat．他一惊，从椅子上跳起身来。
start up . begin to function开始运转
At six o'clock the motor started up．六点钟马达开动起来。
The factory will start up tomorrow．工厂明天开工。
start up . come into existence suddenly or unexpectedly突然出现
Many difficulties have started up．一下子冒出了许多困难。
He seemed to have started up from nowhere．他似乎是忽然从天而降。
start up . begin a career，business，working life，开始从事
The merchant from New York was thinking of starting up in the fruit and vegetable trade．这个纽约商人正在考虑经营蔬菜水果业。
He's thinking of starting up as a private consultant．他在考虑当一名私人顾问。
start with . begin with以…为开端
In teaching English，we usually start with listening and speaking．学习英语我们往往从听说开始。
His illness started with a slight cough．他的病开始只是一点咳嗽。
starve for . need very much；be hungry for非常需要；极需
The poor children in the streets are starving for bread．街上穷苦的孩子非常需要食物。
starve out . force somebody to surrender or leave a hiding place by preventing food from reaching him用饥饿迫使出来投降
Instead of attacking the town the enemy surrounded it with the intention of starving the inhabitants out．敌人对这座城市围而不攻，企图用饥饿迫使居民出来投降。
It took just a week to starve the prisoners out．只用了一星期就使囚犯因饥饿而投降。
stay away . remain away；be away离开；不接触
I hope you'll stay away from those rough boys．我希望你不要同那些粗野的孩子在一起。
stay behind . remain after other people have left留在后面；留下来不走
Several students stayed behind after the lecture to ask questions．有几个学生课后留下来问问题。
stay in . remain indoors留在家中
I'll stay in to wait for his telephone call．我将留在家中等他的电话。
Let's stay in tonight and read instead of going to a movie．咱们今晚不去看电影，呆在家里看书吧。
stay off . continue to be at a distance from保持距离
Tell the children to stay off the road．叫孩子们离开公路远点。
stay off . avoid避开
The doctor advised him to stay off fattening．医生建议他不要吃高脂肪食物。
You'll have to stay off beer if you really want to lose weight．如果你真想减肥，就不能再喝啤酒了。
stay off . not go to school，work，不上学；不上班
I don't feel very well．I think I'll stay off tomorrow and have a day in bed．我今天感到不舒服，明天我不去上班了，在床上躺一天。
stay on . prolong one's stay继续呆下去；继续留下去
I'll stay on this evening and help you，if you like．如果你愿意，我今晚留下来帮你。
He is staying on at school for another year．他在学校还要再呆一年。
He came for a week's holiday and stayed on a month．他来度假，假期只有一周，他却住了一个月。
stay out . remain away from home不在家
She stayed out last night until four o'clock．她昨夜四点才回家。
stay out . continue to refuse to work继续拒绝工作
All the workers are staying out until their demands are met．所有工人都拒绝复工，直到满足他们的要求。
stay put . remain in the same place呆在原处；停留在原处
I've fixed the handle，and it should stay put now．现在我已经把把手固定好了，它不会再掉下来了。
Harry's father told him to stay put until he came back．哈里的父亲吩咐儿子不要离开，等他回来。
stay up . continue to be high不下降
If his temperature stays up all day， call the doctor．假如他的体温居高不下，就请医生吧。
The temporary roof won't stay up much longer．那临时屋顶挺不了多久。
stay up . remain late out of bed迟睡
Please don't stay up for me，I may be late．不要迟睡等我，我可能会晚回来的。
He stays up late most nights，reading business reports．他常常熬夜看业务报告。
stay with . live with与…住在一起
Tom is now staying with us．汤姆现在与我们住在一起。
She stayed with her aunt while she was in Shanghai．她在上海时住在她姑妈家里。
stay with . hold out（a task，a contest，）；last out使…持续下去；使维持下去
We must stay with the task as long as we can．这个任务我们能坚持多久就要坚持多久。
Ted stayed with his homework until it was done．泰德坚持把作业做完。
stay with . be together with somebody ；not leave与…留在一起；不离开
Stay with me until we get out of the crowd．不要分开，跟着我走出人群。
stay with . continue to listen even though one may be tempted to go away继续听…说下去
Just stay with me a minute longer．I'm sure l can convince you．再听我讲一下，我肯定可以说服你们。