Hi EFers and teachers around.
I need to justify myself about which sentences below are correct:
(I did search and study the thread but still fail to make myself clear on this)
1) I would not have to realize that mistake until I join and intensively study the languange at englishforum.com.
2) I would not have realized that mistake until I join and intensively study the languange at englishforum.com.
3) I would not to have realized that mistake until I join and intensively study the languange at englishforum.com.
Thanks