keep at（及物，不可分）继续干下去
Keep at it！坚持下去！不要松劲！
Once you are engaged in a cause of significance，you must keep at it.你一旦从事有意义的事业，就应当坚持不懈。
Provided you keep at your scientific research，you will succeed.只要你坚持不懈地做你的科学研究，你就会成功。
Pedley could solve the problem if he kept at it.佩德利如果坚持下去，就能解决问题。
keep back（及物，可分）隐讳
It is wrong for a man to keep back his feelings from his wife.对妻子隐瞒自己的感情是不对的。
If I whisper you my secret，will you promise to keep it back from others？如果我把自己的秘密悄悄地告诉你，你能答应不告诉别人吗？
I will keep nothing back from you.我对你无所保留。
keep down（及物，可分）抑制
David tried to keep down his living expenses.戴维竭力省吃俭用。
The Government has taken measures to keep hepatitis down.政府已采取措施防止肝炎流行。
The transmitter is automatically kept down.这发报机是自动控制的。
keep...from...1（及物，必分）阻止（某人）做（某事）
When the icebound lake begins to thaw，please keep children from skating on it.当冰封的湖面开始解冻时，请别让孩子们在湖上滑冰。
Can't you keep your son from getting drunk and creating a disturbance？你没办法防止你的儿子酗酒滋事吗？
Illness kept me from joining in the evening party.我因生病，没有参加晚会。
keep...from...2（及物，必分）不让（某人）知晓（某事）
Keep nothing from me.什么也不要瞒我。
We kept the fact from you because of your illness.因为你那时生病，我们没有把实情告诉你。
He kept his illness from his comrades.他不让同志们知道他的病情。
keep off（及物，可分）避开，不接近
Keep off the meadow.（告示）禁止践踏草地。
He made his way into the crowd to keep the enemy agents off.他钻进人群中以避开敌特。
keep on1（不及物）继续前进
I'm sorry for having interrupted you.Please keep on.我很抱歉打断了你们的谈话。请继续谈吧。
Keep on，I'm listening.继续说下去，我听着。
If you keep on like this，you'll lose your job.你如果继续这样下去，会丢掉你的差事的。
Keep on until you reach the stop sign，then turn left.继续往前走，到车站招牌处向左拐。
keep on2（及物，不可分）继续（做某事）
She kept on singing.她唱个不停。
He kept on working until he lost his working ability.他一直工作到丧失工作能力为止。
She kept on working as a nurse at that hospital for another three years.她在那个医院又继续当了三年护士。
keep...on（及物，必分）不断地拥有或穿等
Your overcoat is worn out.Don't keep it on.你的大衣已经穿破，别再穿了。
Since renting the flat，I've kept the right to use it on.自从租这套房子以来，我一直拥有它的使用权。
keep on at（及物，不可分）唠叨［纠缠］
My son kept on at me to buy him a toy car.我儿子不停地向我唠叨，要我给他买一辆玩具汽车。
Don't keep on at me about the bicycle！I'll mend it as soon as I have time.别老向我没完没了地谈自行车的事，我一有空就会把它修好的。
keep to1（及物，不可分）遵守
China kept to the agreement.中国信守这项协议。
When you are delivering a speech，please keep to the subject.发表演说时，请不要离题。
If you join the club，you must keep to its rules.你要是参加这个俱乐部，就必须遵守其章程。
keep to2（及物，不可分）坚持
The young man kept to self-education.这个小伙子坚持自学。
Franc kept to his good habits.弗兰克保持着他的良好习惯。
keep...under（及物，必分）控制
It is the duty of the Government to keep air pollution under.控制空气污染是政府的责任。
A diabetic should keep his eating and drinking under.糖尿病患者应该节制饮食。
This fort keeps the whole valley under.It must be defended，whatever the cost is.这个碉堡控制着整个山谷，必须不惜任何代价加以保卫。
The forest fire in that area was kept under.那个地区的森林大火被扑灭了。
keep up1（不及物）跟上步伐
Can you keep up or will we have to walk more slowly？你能跟上来吗？要不我们得走慢些？
Keep up！We're falling behind.快跟上！我们落后了。
keep up2（不及物）持续
The work must keep up.这工作必须继续进行。
The wet weather kept up for nearly a month.潮湿天气持续了将近一个月。