As far as I know, words following both parts of this conjunction (not only and but also) should belong to the same parts of speech. For example, if a verb follows "not only" , then a verb should also follow "but also" .
1- The car not only is economical but also feels good to drive.
After I have seen this sentence, I am wondering that do I have to use same verb form in both parts of this conjuction. For example: If I use a verb in past simple form after "not only", does that mean do I have to use another verb in past simple after "but also" ?
2- She not only sued him, but also wants money from him.
3- He not only has won the last Eisner, but he is also working for another.
Are these examples grammatically wrong?