The usage of "not only ～　but also"
If I use a phrase "not only ～　but also", Which one is correct?
1.I don't only study a lot but also play a lot.
2.I not only study a lot but also play a lot.
3.Not only I study a lot but also play a lot.
And are there other saying ways?

In addition, can these sentence be negative like
1.I don`t know how to make the negative of this sentence.
2.I not only don't study a lot but also don't play a lot.
3.Not only I don't study a lot but also don't play a lot.

Question

The usage of  "not only ～　but also"
If I use a phrase "not only ～　but also", Which one is correct?
1.I don't only study a lot but also play a lot.
2.I not only study a lot but also play a lot.
3.Not only I study a lot but also play a lot.
And are there other saying ways?

In addition, can these sentence be negative like
1.I don`t know how to make the negative of this sentence.
2.I not only don't study a lot but also don't play a lot.
3.Not only I don't study a lot but also don't play a lot.

Answer

1.I don't only study a lot but also play a lot
This is OK

2.I not only study a lot but also play a lot.
This is OK

3.Not only I study a lot but also play a lot.
This is wrong. If you begin with 'Not only', you need an inversion - there has to be a verb before the noun 'I'. Because this is a simple tense, you use 'do' as an auxiliary : 
'Not only do I study a lot but I also play a lot.'

None of these negative sentences work with 'not only ..but also'. At a stretch, you could say 'I not only don't study a lot but I don't play a lot, either', but it's a little awkward. It might be neater to say something like 'I neither study a lot nor play a lot.'

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