don't I back? don't you back? doesn't she back? don't we back? don't you back? don't they back?
Presente continuo
am I not backing? aren't you backing? isn't she backing? aren't we backing? aren't you backing? aren't they backing?
Pretérito
didn't I back? didn't you back? didn't she back? didn't we back? didn't you back? didn't they back?
Pretérito continuo
wasn't I backing? weren't you backing? wasn't she backing? weren't we backing? weren't you backing? weren't they backing?
Presente perfecto
haven't I backed? haven't you backed? hasn't she backed? haven't we backed? haven't you backed? haven't they backed?
Presente perfecto continuo
haven't I been backing? haven't you been backing? hasn't she been backing? haven't we been backing? haven't you been backing? haven't they been backing?
Pluscuamperfecto
hadn't I backed? hadn't you backed? hadn't she backed? hadn't we backed? hadn't you backed? hadn't they backed?
Pluscuamperfecto continuo
hadn't I been backing? hadn't you been backing? hadn't she been backing? hadn't we been backing? hadn't you been backing? hadn't they been backing?
Futuro simple
won't I back? won't you back? won't she back? won't we back? won't you back? won't they back?
Futuro continuo
won't I be backing? won't you be backing? won't she be backing? won't we be backing? won't you be backing? won't they be backing?
Futuro perfecto
won't I have backed? won't you have backed? won't she have backed? won't we have backed? won't you have backed? won't they have backed?
Futuro perfecto contínuo
won't I have been backing? won't you have been backing? won't she have been backing? won't we have been backing? won't you have been backing? won't they have been backing?
Condicional
Presente
wouldn't I back? wouldn't you back? wouldn't she back? wouldn't we back? wouldn't you back? wouldn't they back?
Presente continuo
wouldn't I be backing? wouldn't you be backing? wouldn't she be backing? wouldn't we be backing? wouldn't you be backing? wouldn't they be backing?
Passado
wouldn't I have backed? wouldn't you have backed? wouldn't she have backed? wouldn't we have backed? wouldn't you have backed? wouldn't they have backed?
Passado continuo
wouldn't I have been backing? wouldn't you have been backing? wouldn't she have been backing? wouldn't we have been backing? wouldn't you have been backing? wouldn't they have been backing?