remain : 指某人或某物仍留在原处或保持原来的状态。

stay : 普通用词，多指人在某地暂时逗留。有时可指较长时间的居留。

keep : 指长时间地保有，保存某物，防止别人占去，强调安全和感情上的依附

1.Keep 相当于 be 动词 ，后跟adj，表示维持一种状态，比如：keep calm

keep 还可以跟n. 表示保留收藏什么东西，比如：keep this book

而 stay 后跟 副词，介词短语情况比较多。比如stay here，stay overnight

2.stay、remain和keep辨析

(1．表示“继续呆在某处”时，应该用不及物动词remain或stay，

例如： Shall I go or stayStay indoors for a few days until you recover from your cold. He remained in his seat after all the other students had gone home.

(2．表示“暂住、短期停留”时，只能用不及物动词stay。

例如： He is staying at Hilton Hotel. My mother-in-law stayed with us this week when she visited us.

(3．表示“残留、剩下”时，只能用不及物动词remain，

例如： Not much of the house remained after the fire. Of the seven brothers, only four now remain; the rest are dead.

(4．表示“继续保持或处于某种状态”时，应视具体情况在上述动词中进行选择：

(1)表示“继续保持或处于原来的状态”时，可用remain或stay，

例如： Three of them remained single.Shops should remain open till later in the evening. The door stayed closed.But the police themselves prefer to stay unarmed.

(2)表示“需要设法才能保持或处于某种状态”时，应用keep，

例如： She knew she must keep calm. I wish those children would keep quiet. Although they have many difficulties, they keep happy. Paul managed to keep awake by drinking lots of strong black coffee.

(3)表示“使某人或某物保持某种状态”时，只能用及物动词keep，

例如： She had kept him waiting twenty minutes on this occasion. Why do you always keep your windows closed

remain 可与stay 互换,但它强调“继续停留于一处或保持原状态、情况性质而不改变”。

如:This place remains cool all summer.这个地方整个夏天都凉爽.

stay强调“某人/某物继续留在原地而不离开”。

如:He stayed to see the end of the game.他一直呆到比赛结束.

keep 系常用词,指“使继续下去”“使较长时期地置于不脱离控制、掌握、照料或变化之下”。

如:keep the desk clean and tidy.

保持桌子干净整洁.