1、侧重点不同
remain 强调“继续停留于一处或保持原状态、情况性质而不改变”。
例句：Train fares are likely to remain unchanged.
火车票价很可能会保持不变。
stay强调“某人[物]继续留在原地而不离开”。
例句：Can you stay behind after the others have gone and help me clear up?
你能不能等别人走后留下来帮我收拾收拾？
2、延伸意不同
stay还可表示“暂住、短期停留。
例句：‘Do you want a drink?’ ‘No, thanks, I can't stay.’
“你要不要喝一杯？”“不，谢谢，我不能久待。”
remain还可表示“继续保持或处于原来的状态”。
例句：In spite of their quarrel, they remain the best of friends.
尽管有过争吵，他们仍是最好的朋友。
3、词源不同
remain：14世纪晚期进入英语，直接源自古法语的remain；最初源自拉丁语的remanere：re (回) + manere (放，置），意为保留。
stay： 1440年进入英语，直接源自中古法语的estai；最初源自古典拉丁语的stare，意为站立。
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第1个回答 推荐于2017-09-12
remain stay
都指“继续停留”或“继续保持某种状态、关系或行动。”remain 常可与stay 互换。
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 stay?
Stay 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“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.
3．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.
4．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.
5 remain 强调“继续停留于一处或保持原状态、情况性质而不改变”, stay强调“某人[物]继续留在原地而不离开”,如:
This place remains cool all summer.
这个地方整个夏天都凉爽。
He stayed to see the end of the game.
他一直呆到比赛结束。
都指“继续停留”或“继续保持某种状态、关系或行动。”remain 常可与stay 互换。
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 stay?
Stay 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“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.
3．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.
4．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.
5 remain 强调“继续停留于一处或保持原状态、情况性质而不改变”, stay强调“某人[物]继续留在原地而不离开”,如:
This place remains cool all summer.
这个地方整个夏天都凉爽。
He stayed to see the end of the game.
他一直呆到比赛结束。
参考资料：http://www.chinaedu.com/101resource004/wenjianku/200515/101ktb/ynjd/yncepe0a/yncepe0a.htm
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