(2) look, seem 之后可以接介词 like, 但 appear 之后不能。如: Helooks [seems] like a fool. 他看起来像个大傻瓜。 (3) 三者均可后接不定式,但 look 之后一般只限于 to be。如: 正:He seems [appears, looks] to be tired. 他好像很累了。 正:He seems [appears] to...