I want to know why you didn't do as told.为什么不是do as told to?不是有do as I tell you to?如果as换成what,

I want to know why you didn't do as told.为什么不是do as told to?不是有do as I tell you to?如果as换成what,

其实是个省略句,完整句子是
I want to know why you didn't do as i told you.按我告诉你的方法做.不是tell sb to do sth的句型.
换成what时,I want to know why you didn't do what i told you.为什么不做我告诉你的事情.

这是以下的简化句
i want to know why you didn't do as what you were told.

1.加不加to主要由习惯决定。do as I tell you to是do as I tell you to do 的省略，习惯上保留to。如果你用do as told to，我想问题也不会太大，因为不会引起误会，但习惯上不加to，如是考试不要加。
2.换成what: I want to know why you didn't do what you were (had been) tol...

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1.加不加to主要由习惯决定。do as I tell you to是do as I tell you to do 的省略，习惯上保留to。如果你用do as told to，我想问题也不会太大，因为不会引起误会，但习惯上不加to，如是考试不要加。
2.换成what: I want to know why you didn't do what you were (had been) told to do.

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这里肯定是已经告诉过了啊，所以要用told，