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

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

　　而stay后跟副词,介词短语情况比较多.比如stayhere,stayovernight

　　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：ShallIgoorstay?Stayindoorsforafewdaysuntilyourecoverfromyourcold.Heremainedinhisseatafteralltheotherstudentshadgonehome.2．表示“暂住、短期停留”时,只能用不及物动词stay.例如：HeisstayingatHiltonHotel.Mymother-in-lawstayedwithusthisweekwhenshevisitedus.3．表示“残留、剩下”时,只能用不及物动词remain,例如：Notmuchofthehouseremainedafterthefire.Ofthesevenbrothers,onlyfournowremain;therestaredead.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：Threeofthemremainedsingle.Shopsshouldremainopentilllaterintheevening.Thedoorstayedclosed.Butthepolicethemselvesprefertostayunarmed.(2)表示“需要设法才能保持或处于某种状态”时,应用keep,例如：Sheknewshemustkeepcalm.Iwishthosechildrenwouldkeepquiet.Althoughtheyhavemanydifficulties,theykeephappy.Paulmanagedtokeepawakebydrinkinglotsofstrongblackcoffee.(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：Shehadkepthimwaitingtwentyminutesonthisoccasion.Whydoyoualwayskeepyourwindowsclosed?