Friends, would you please tell me if I use "Not only,but also" correctly?
1- Not only have these conditions been not prepared in developed countries, but developing countries also have not accepted them.
2- Not only have not these conditions been prepared in developed countries, but also have developing countries not accepted them.
3- Not only have these conditions not been prepared in developed countries, but (also) in developing countries.
Could you tell me which sentence is correct, where is the right location of 'not' in the above examples and can we ignore the verb after 'but also' like example 3?
In the end, do you have any better idea to write the mentioned example in a more formal form? Thanks a lot.