Jack was soon told why he did was not necessary.这个句子有错吗?

Jack was soon told why he did was not necessary.这个句子有错吗?
能给讲一下why为何不对吗？

有错,很有问题
我给你改改：
1.Jack was soon told why what he did was not necessary .
2.Jack was soon told what he did was not necessary.
在名词性从句中,
连接副词：when,why,where,how（在从句中充当状语）这些关系副词后面的句子是完整的
1.Tell me when we shall leave.
2.That’s why he speaks English so well.
3.Where we can get the money is just our problem.
4.I don’t know how I can find him.
再来看你这个句子,why 后面是 he did was not necessary ,两个谓语动词呢,很显然错,就把它改成 我说的上面两个了 .

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