英语翻译个句子

Why I can't do as well as him.
这里的意思是：我为什么不能做得和他一样好，意思是我已经肯定自己没有他做得好了，问的是我为什么没有他做得好的结果
Why can't I do as well as him.
这里的意思是：我不知道我为什么不能做得比他好，问的是我为什么不能做得和他一样好，表示问的是原因。而第一种则问的是事情的结果。

其中"as"也可改成“so”.因为前者可用于肯定与否定句中，后者只用于否定句中。

我为什么不能和XX做得一样好？
1.Why can't I do as well as XX?
2.Why don't I do as well as XX?

Why can't I do so well as XX?

1.Why can't I do as well as XX do?

why can't I do as well as XX?

我为什么不能和XX做得一样好？
I why can't make out with XX similar good?