He looks well.——指从健康角度考虑,它的意思是“气色好”。如:
You don’t look well Is anything wrong? 你气色不好,哪儿不舒服吗?
You’re looking well—have you been on holiday? 你气色很好——是不是休过假?
He looks good.——指除健康外的其他方面(如外表、资历、人品等)。如:
She looks good on paper, ie has good qualifications. 她看来资历很好。
You look good;I like your new hair style. 你真漂亮,我喜欢你的新发型。
You look good in that dress. 你穿那条连衣裙好看。
另外,look well只用于人,look good可用于人或事物。如:
That sweater looks good on you. 那件毛衣你穿上很好看。
This year's sales figures are looking good. 今年的销售数字看上去不错。
The food looked good, but I was too full to eat. 食物看来不错,但我饱得吃不下去了。
提供点理解,仅供参考。
1. Merriam-Webster's Dictionary of English Usage有这样的解释:
Look well and feel well tend to express good health. Look good does not generally refer to health, it relates to some aspect of appearance.This need not be personal appearance.
2. 国内陈敦金对“well”的解释似乎有些绝对:
good 和well都可以当形容词用在连系动词be,seem,look和feel之后,但语义不同。well只指“健康状况”。如:
She looks/seems/feels well. (healthy)
She looks good. (good appearance)
She feels good. (cheerful)
Those cakes look good/*well.
(Those cakes look as if they taste good.)
因为还有这样的说法,很有参考价值:
"That apple looks good."解释为"That looks like a good apple.",而"He looks good."解释为"He appears to be a good man."。look well一般用于指健康状况,如"He looks well."解释为"He looks healthy."或"He seems to be in good health."。look well也可以表示某人的外观或外表(appearance),如"She looks well in that hat."解释为"She makes a favourable impression."
但是,well作为形容词描述外观这一说法,不少辞书没有收录。不过,在《韦氏大学英语词典》的well形容词词条,有这样的解释:
well adjective
pleasing or satisfactory in appearance
Our garden looks well.
Conrad Aiken