Do not wait to do the things you know to be done.
【分析】这个句子中只有一个定语从句( you know), to be done 是动词不定式作定语,即: you know 和 to be done 都是 the things 的定语。
Do not wait to do the things that you know need to be done.
解答:以上属于嵌入式定语从句,关系代词that在定语从句中的宾语从句作主语。
【1】Do not wait to do the things.【否定祈使句】
【2】You know the things need to be done.【宾语从句】
备注:把第2句the things用关系代词that替换就是第3个句子。
【3】That you know need to be done.
备注:把第3句放在主句后面就是第4个句子。
【4】Do not wait to do the things that you know need to be done.
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