aver that + clause
最常见的结构，后接that引导的从句，多用于正式书面语和法律文书。
She averred that she had never seen the letter.
她断言自己从未见过那封信。
断言；坚称；郑重声明
证明；证实（自己提出的主张）；断言某事的真实性；自信地肯定某事；证明或证实(自己提出的指控或请求)；坚称；[法] 立证
To assert or affirm something confidently; to declare it positively.
断言某事的真实性；自信地肯定某事
To assert the truth of (something); to affirm (something) with confidence; to declare (something) in a positive manner.
证明或证实(自己提出的指控或请求)
To justify or prove (an allegation or plea that one has made).
一般现在时
He avers that the report is accurate.
他断言这份报告是准确的。
一般过去时
She averred her innocence in court.
她在法庭上坚称自己无罪。
现在完成时
They have averred their commitment to the project.
他们已经声明了对该项目的承诺。
注意：aver后常接that从句。
The teacher avers that the exam will be fair and cover only what was taught.
老师坚称考试会公平，并且只考教过的内容。
用法提示：avers 是 aver 的第三人称单数现在时，后接 that 从句表达自信断言。
The traveler averred his story despite his friend's doubts.
那位旅行者不顾朋友的怀疑，坚称自己的经历属实。
用法提示：averred 是 aver 的过去式，后接名词短语作宾语，表示郑重坚称某内容属实。
The chef has averred that the recipe originated in his hometown.
厨师坚称这道菜的菜谱源自他的家乡。
用法提示：has averred 是 aver 的现在完成时，表示到目前为止一直坚持断言。
最常见的结构，后接that引导的从句，多用于正式书面语和法律文书。
She averred that she had never seen the letter.
她断言自己从未见过那封信。
直接接名词作宾语，表示郑重肯定某事，日常口语中很少使用。
The witness averred his innocence under oath.
证人在宣誓后坚称自己无罪。
被动句式，多见于法律或正式文书，意为“据称、有人断言”。
It was averred that the company had concealed the losses.
有人断言该公司隐瞒了亏损。
grammar · medium
易错句子He avered that the report was accurate.
正确表达He averred that the report was accurate.
aver 是重读闭音节结尾的动词，变为过去式和过去分词时要先双写 r 再加 -ed，即 averred，不能写成 avered。
grammar · medium
易错句子She averred about her innocence.
正确表达She averred her innocence.
aver 是及物动词，后面直接接名词宾语或 that 从句，不需要介词 about；受汉语“断言关于某事”影响而加 about 是错误的。
grammar · medium
易错句子The lawyer made an aver that the contract was valid.
正确表达The lawyer averred that the contract was valid.
aver 只作动词，不能像名词那样搭配 make an aver；表示“断言”应直接用动词 averred 加 that 从句。
assert 与 aver 都能表示“断言”，但 assert 是中性通用词，口语和书面语都常用，强调自信地陈述；aver 更正式、偏法律或古旧，语气更郑重，常指“郑重断言/为证明自己的主张而断言”。日常表达通常优先用 assert。
affirm 侧重“肯定、确认”，多用于确认事实、立场或法律裁决，常带回应质疑的意味；aver 强调主动、郑重地单方面断言某事为真。两者在正式书面语中偶有重叠，但 affirm 更偏“予以确认”，aver 更偏“坚称”。
allege 指提出未经证实的说法，暗含“可能不实”，常见于新闻和法律语境，常与“指控”搭配；aver 则是正面断言某事为真，语气更肯定。两者都可用于法律文本，但 allege 偏“声称（待证）”，aver 偏“坚称/证明”。
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