1
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
先理解核心含义，再看它在真实句子里的用法。
使说不出话来
past tense and past participle of dumfound
She was dumfounded by the unexpected news.
她被这个意外的消息惊得说不出话来。
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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。
Her answer dumfounded the teacher for a moment.
她的回答让老师一时说不出话来。
The magician's trick dumfounded the audience.
魔术师的把戏让观众目瞪口呆。
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。
Not this
I was dumfounding by the news.
Use this
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。
Not this
He dumfounded at her words.
Use this
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。
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Dictionary facts from ECDICT.