[enyafriend]

Corrections below (In bold).

I have a problem with base 2 + tai verbs.
If I have to say I want to go I say:
1) ikitai (plain form)
(2) ikitai desu (honorific form)>>>polite speech
is this right?

And another question.. how do i get the negative form? I've read somewhere that I say:
ikitakunai >>>>this is the correct negative form
but somewhere else I've read that I have to say:
ikitaku wa nai >>>>NOT a ~tai negative form
What form is the right one?

And about the past form, is this right?
1)ikitai deshita (positive gentle form)
2)ikitaku wa arimasen (negative gentle form)>>>>NOT a ~tai negative form
3)ikitakatta (negative plain form) >>>>past tense plain
4) positive plain form????

See below:
(plain) ikitai/ikitakunai
(polite) ikitai desu/ikitakunai desu

(negative plain) ikitakatta/ikitakunakatta
(negative polite) ikitakatta desu/ikitakunakatta desu