是副词.简单的判断法就是看它能否放到宾语的后面.介词是不可以的.put on the coat 可以变成 put the coat onturn off the light --- turn the light off这里的 on,off 是副词.walk on the spotjump off the wall 不能这样变换,是介词又,代词作宾语时,副词只能摆在后面put on the coat ,put it ontake out the books,take them out代词作宾语时,介词只能摆在前面jump off the wall ,jump off it.
