题目内容：

keep one's eye on keep one's eyes on keep an eye on的区别

优质解答

keep an eye on sth/sb.表示留意某物,照看某物,比如：
Can you keep an eye on my lugguage while I'm away.我走开一下,你能不能帮我照看一下包.
About the book you mentioned,I'll keep an eye on it for you.关于你要的那本书,我会帮你留意的.
你说的另外两个表达没有见过,应该是错误的.另外有几个习语是用的one's eyes,但后面的介词不是on,而是形容词open,或者peeled.即：keep one's eyes open/peeled.意思是仔细观察.