二、用于it开头的句子的问题
三个单词都可用于 it 开头的句子,并且三者之后都可接以 as if 或者 as though 引导的从句,此外, appear 与 seem 之后还可接 that 引导的从句
It looks [seems, appears] as if it might be part of the original family recipe.
看来,它可能早已是人们家传食物秘方的一部分。
It seems that not everyone experiences this kind of strong love.
由此看来,并非每个人都体验过如此深沉的爱。
注意事项:为避免重复,appear与seem后接的 that 从句有时可用so, not 代替。
三、后接不定式的问题
三个单词都可后接不定式,但是 look 之后一般只限于 to be,而且较少见:
She seems [appears, looks] to be very tired. 她好像很累了。
四、后接介词like的问题
look, seem 的后面可接介词 like,但是 appear 之后一般不可以接:
He looks [seems] like a southerner.
他看起来像是一个南方人。