1. appear：显得，好像。有时含有表面上显得，而事实未必的意味。例如：

例47：This kind of apples appears good, but in fact it tastes sour.

　　(这种苹果看起来好，实际吃起来酸。)

　　2.seem：好像。暗示判断有一定根据，往往接近事实。例如：

　　例48：You seem to have made the same mistake again this time.

　　(你这次似乎又犯了同样的错误。)

　　例49：It seems that it is going to rain soon.

　　3.look：好像。表示凭感觉作出的判断。例如：

　　例50：What’s wrong with you? You look pale.

　　例51：It looks like rain. (看来要下雨了。)