词汇
一、从所接宾语来看
dress 要接“人”作宾语(不接“衣”作宾语),而其余的则要接“衣”作宾语(而不接“人”作宾语).
She dressed the baby. 她给婴儿穿衣服.
She was wearing her mother’s coat. 她穿她母亲的大衣.
Put your coat on when you go out. 出去时穿上外套.
She has a red jacket on. 她穿着一件红色的短上衣.
二、从表示动作与状态来看
wear 和 have on 通常指穿着衣服的状态,put on 通常指穿衣的动作,而 dress 既可指动作也可以指状态.如：
She wore [had on] a new dress. 她穿着一件新衣服.
Put on your clothes quickly. 赶快穿上衣服.
She is dressing herself. 她在穿衣服.
She always dresses in black. 她总是穿黑衣服.
注：dress 还通常用于被动语态.如：
The girl was poorly dressed. 这女孩衣着寒酸.
He was dressed as a woman. 他男扮女装.
三、从所使用的时态和语态来看
wear 和 have on 虽然都可表示穿衣的状态,但 wear 可用于进行时态和被动语态,而 have on 却既不可用于进行时态也不可用于被动语态.如：
He was wearing a new jacket. 他当时穿着一件新夹克.
Such clothes are not often worn nowadays. 现在那样的衣服很少有人穿了.
四、其他用法上的区别
wear 除可表示穿衣外,还可表示戴表(花、纪念章等)以及留头发或胡须等,而 dress, put on 一般不这样用.如：
He seldom wears a watch. 他很少戴表.
He wears his hair long. 他留着长发.
注：have on 有时也这样用.如：
They all had dark glasses on. 他们都戴着墨镜.
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