My father earns a lot of money.My mother earns a

Not only my father but also my mother earns a lot of money.
再问： 如果分成两句怎么改呢
再答： 这是连接2个不同主语的句型，通常是这样使用。 要分成两句的话那就用强调句吧。 Not only does my father earn a lot of money, but also my mother does.
再问： 可不可以说but also my mother earns a lot of money 呢
再答： 语法上应该没什么错，但是就会变得跟前面重复了，重复的内容可以用助动词代替，例如： He likes apples, so do I（=I like apples too）.