THE walls were dirty怎么改否定

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THEwallsweredirty怎么改否定THEwallsweredirty怎么改否定THEwallsweredirty怎么改否定are这里没有表示过去的标志词,所以用一般现在时即可.

THE walls were dirty怎么改否定
THE walls were dirty怎么改否定

THE walls were dirty怎么改否定
are
这里没有表示过去的标志词,所以用一般现在时即可.