the problem (discuessed) at meeting yesterday has not been solved yet.为什么这里不能用 WAS DISCUESS

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the problem (discuessed) at meeting yesterday has not been solved yet.为什么这里不能用 WAS DISCUESS
the problem (discuessed) at meeting yesterday has not been solved yet.
为什么这里不能用 WAS DISCUESS

the problem (discuessed) at meeting yesterday has not been solved yet.为什么这里不能用 WAS DISCUESS
这里discussed是过去分词当作定语,修饰前面的名词problem(讨论的问题).
如果用了was discussed,句子里就有了两个动词(discussed以及has not been solved),语法上不对.
当然,可以改成勇从句来表达:The problem which was discussed at the meeting yesterday has not been solved yet.

这里是过去分词作定语修饰前面的problem.
如果用was discussed 就是谓语形式,而后面已经有了谓语has not been solved,就不对了。一个简单句中只能有一个谓语动词,而其他动词必须用”非谓语“形式,而分词和不定式都是非谓语形式、

因为在这里是作定语的,不是作谓语的,所以动词要用的非谓语形式。

这是做定语,过去式分词做定语