be dumfounded by/at sth
常用于被动或系表结构，表示因某事而震惊。
She was dumfounded by the unexpected news.
她被这个意外的消息惊得说不出话来。
使说不出话来
past tense and past participle of dumfound
使说不出话来
imp. & p. p. of Dumfound
The sudden news dumfounded the whole family.
这个突如其来的消息让全家人目瞪口呆。
用法提示：dumfounded 是动词 dumfound 的过去式，表示“使目瞪口呆”。
Her answer dumfounded the teacher for a moment.
她的回答让老师一时说不出话来。
用法提示：此处 dumfounded 作及物动词过去式，主语是 her answer。
The magician's trick dumfounded the audience.
魔术师的把戏让观众目瞪口呆。
用法提示：dumfounded 在这里表示“使惊讶得说不出话”的过去式。
常用于被动或系表结构，表示因某事而震惊。
She was dumfounded by the unexpected news.
她被这个意外的消息惊得说不出话来。
后接不定式，表示做某事时感到震惊。
He was dumfounded to learn the truth.
他得知真相后惊得说不出话来。
作定语修饰名词，描述震惊的表情或神态。
He had a dumfounded expression on his face.
他脸上露出惊愕的表情。
grammar · medium
易错句子I was dumfounding by the news.
正确表达I was dumfounded by the news.
dumfounded 是过去分词用作形容词，而现在分词 dumfounding 在此处错误。
grammar · medium
易错句子He dumfounded at her words.
正确表达He was dumfounded by her words.
dumfounded 是及物动词的过去分词，应使用被动结构或作形容词，不能作为不及物动词的主动形式。
dumbfounded是形容词，表示惊呆的状态；dumfounded是动词dumfound的过去式，表示使某人说不出话。
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