He is interested in not only English but also math.

[neb090]

1. He is interested in not only English but also math.
2. He is interested not only in English but also in math.
3. He is not only interested in English but he is also interested in math.
4. He is not only interested in English but also interested in math.
5. He is not only interested in English but also in math.
6. Not only is he interested in English but he is also interested in math.
7. Not only is he interested in English but also in math.

I wrote these sentences by myself, and are they grammatically correct?

 

[jutfrank]

They're all grammatical. How does that help you?

 

[teechar]

I wrote these sentences by myself. , and Are they grammatically correct?

 

[neb090]

They're all grammatical. How does that help you?

I am just wondering whether I could omit the same subject or adjective after but also.