1．表示“繼續呆在某處”時，應該用不及物動詞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“暫住、短期停留”時，只能用不及物動詞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“殘留、剩下”時，只能用不及物動詞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“繼續保持或處於某種狀態”時，應視具體情況在上述動詞中進行選擇： (1)表示“繼續保持或處於原來的狀態”時，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“需要設法才能保持或處於某種狀態”時，應用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種狀態”時，只能用及物動詞keep，例如： She had kept him waiting twenty minutes on this occasion. Why do you always keep your windows closed?參考資料： http://www.chinaedu.com/101resource004/wenjianku/200515/101ktb/ynjd/yncepe0a/yncepe0a.htm
remain和keep辨析
1．表示“繼續呆在某處”時，應該用不及物動詞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“暫住、短期停留”時，只能用不及物動詞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“殘留、剩下”時，只能用不及物動詞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“繼續保持或處於某種狀態”時，應視具體情況在上述動詞中進行選擇： (1)表示“繼續保持或處於原來的狀態”時，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“需要設法才能保持或處於某種狀態”時，應用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種狀態”時，只能用及物動詞keep，例如： She had kept him waiting twenty minutes on this occasion. Why do you always keep your windows closed?參考資料： http://www.chinaedu.com/101resource004/wenjianku/200515/101ktb/ynjd/yncepe0a/yncepe0a.htm