(1)certain强调所指事情的无可争辩性,而sure用法比较随便。
(2)certain和sure的主语都可以为人,但certain还可用于“It is certain that...”句式中,sure不能。
He is sure/certain that he can catch the train.
It is certain that he can catch the train.
. know, recognize 辨析
(1)know认识,熟悉,是延续性动词,可以与表示一段时间的时间状语连用。
They have known each other for more than ten years.
(2)recognize认出,辨认出,是短暂性动词,表示通过视觉、听觉或嗅觉认出原来所熟悉的人或物, 不能与表示一段时间的词连用。
She had changed so much that I couldn’t recognize her at the first sight.
. gather,contain,include,collect辨析
这四个词都有“收集”的意思,但在意义及用法上有所不同。
(1)gather指把分散的东西集中在一个地方,例如收庄稼等。
She gathered her papers and books together. (2)contain可用于表示包含所含之物的全部或部分。
This book contains all the information you need.
(3)include只能用于表示所包含之物的一部分。
The price includes postage charges.
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