大哥帮忙英语翻译个小句子~

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。

Why can't I do it as well as XX?

Why can't I do it as well as XX

Why can't I do as well as him?

"我为什么不能做得和XX一样好?'
"I why can't make out as good as XX?