那个,He did all what he could to help the p那个,He did all what he could to help the poor child哪错了

那个,He did all what he could to help the p那个,He did all what he could to help the poor child哪错了
那个,He did all what he could to help the p
那个,He did all what he could to help the poor child哪错了

那个,He did all what he could to help the p那个,He did all what he could to help the poor child哪错了
what 应该改成that
what不能引导定语从句,所以要改成that
He did all （that） he could to help the poor child

在定语从句中，如果有all作先行词或者修饰先行词，后面的关系词应改为that.

He did all that he could to help the poor child
He did what he could to help the poor child

用all就不用what