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 contínuo
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?
Preterito contínuo
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 perfeito
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 perfeito contínuo
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?
Mais perfeito
hadn't I backed? hadn't you backed? hadn't she backed? hadn't we backed? hadn't you backed? hadn't they backed?
Contínuo mais perfeito
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
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 contínuo
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 perfeito
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 perfeito 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 contínuo
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 contínuo
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?