He _______ (be not) in the classroom at ten o'clock yesterday. 讲解原因

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He _______ (be not) in the classroom at ten o'clock yesterday. 讲解原因
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He _______ (be not) in the classroom at ten o'clock yesterday. 讲解原因
He _______ (be not) in the classroom at ten o'clock yesterday. 讲解原因

He _______ (be not) in the classroom at ten o'clock yesterday. 讲解原因
答案:wasn't
at ten o'clock yesterday 昨天10点钟,是过去时的时间状语
he 第三人称单数,过去式用 was,否定用:wasn't.
整句翻译:昨天10点他不在教室
不明白的再问哟,请及时采纳,多谢!

might not be/was not
表示都过去的情况的推出,把握不大,用may的过去时,加动词原形的be;或者是讲述一个事实,用一般过去时。
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wasn't yesterday就寿命了这个动作是在过去发生的,用过去时

was,一般过去时。

was not ,
见到yesterday用一般过去时态
be动词的单数的过去式为was