1）*Not only does John like English but also speaks it very well.
张满胜文章用句（表示是错误句子）
2）Not only will they paint the outside of the house but also the inside.
剑桥字典例句
在第1句中，作者表示因为并列连词not only…but also要对接对称结构，而原句前面接了分句后面接了动词短语，故判断错误。
我的疑问是：
假如1是错的，那2呢？
假如2是正确的，那1中的but also对接的成分，能不能看作只不过一个省略了相同主语 的对称分句呢？
第二句是剑桥互联网版上的句子，自然不需要麻烦自己
第一句不是结构对称上有哪些问题， 而是语义逻辑上不太好。
Not only does John like English but also likes Chinese.
这个也有问题？（这里用不需要not only... but also来写另论）
网上有这么一句，倒真的是不对称：
Hes not only intelligent but also has a great sense of humor.
后句可改为Hes not only intelligent but also funny.
Not only does John like English but also speaks it very well.
John likes English; to be honest/to tell you the truth, he can speak it very well.
