1、意思不同
keep away意为“不接近；离开；避开等”。
keep off意为“不接近；使离开”。
2、用法不同
keep away：away是副词，其后通常与from搭配使用。
例如：Keep away from the fire! 勿靠近火炉！
keep off：off既可用作介词，也可用作副词。
例如：Animals were afraid of fire, so they made a big fire to keep wild animals off (= keep off wild animals). 动物怕火， 因此他们生起了一堆大火以防野兽接近。
扩展资料
keep与介词或副词搭配，构成动词短语。
1、keep back意为“阻止；留在后面”。如：
She sat down quietly, but she couldn't keep back her tears.
她静静地坐下来，却忍不住流下了眼泪。
2、keep together意为“在一起；动作协调”。如：
The eight men kept together during the boat race as though they were one.
赛船时，这8个人动作协调，好像一个人似的。
3、keep up意为“持续；使不低落”。如：
The noise kept up all night.
噪音整夜持续着。
4、keep up with意为“跟上；和……来往”。如：
I'm trying my best to keep up with the others in class.
我正在设法赶上班里的其他人。
5、keep...in mind意为“把……记在心里”。如：
The teacher asked us to keep these sentences in mind.
老师要我们把这些句子记在心里。
keepaway和keepoff都有“不接近”的意思,但它们的用法有点不同。
1、keep away远离， 使离开，使站开，后跟宾语时要加介词from,即keepawayfrom。如：1).Itoldthechildrentokeepawayfromthefire.我叫孩子们远离火。2).Susanisinabadtemper,so keep away from her. 苏珊正在生气，你离她远着点。
2、keep off 避开；不接近 如：1).Keep off the grass! (不能用keepaway代替）请勿践踏草地！2).My doctor has warned me to keep off sugar.我的医生劝我别吃糖。拓展（与keep搭配的词组）keep out关在门外；不准入内如： This coat keeps out the wind. 这大衣挡风。 keep on继续；保持如：He just kept on writing. 他正在继续写。keep up继续；坚持；保持；维持如：1).If this rain keeps up the garden will be ruined. 如果这雨继续下，花园就完蛋了。2).The high cost of materials keeps up prices.材料的昂贵费用使价格居高不下。
