He did not know what was______(happen) outside.______上填什么
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He did not know what was______(happen) outside.______上填什么
He did not know what was (happening) outside.
他不知当时外面正在发生什么事情.
这里要填happen的现在分词形式,和was构成过去进行时态.因为前面有be动词,而be动词与实义动词同时使用的场合有被动语态,也有进行时态,这里的情况属于后者.
再问: 答案是happened请你解释一下
再答: 答案不可能是happened,如果把was去掉了还说得过去。
他不知当时外面正在发生什么事情.
这里要填happen的现在分词形式,和was构成过去进行时态.因为前面有be动词,而be动词与实义动词同时使用的场合有被动语态,也有进行时态,这里的情况属于后者.
再问: 答案是happened请你解释一下
再答: 答案不可能是happened,如果把was去掉了还说得过去。
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I didn t know what was happening outside这句话中为什么happen加ing?