don't I back? don't you back? doesn't he 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 he backing? aren't we backing? aren't you backing? aren't they backing?
Pretérito
didn't I back? didn't you back? didn't he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he 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 he have been backing? wouldn't we have been backing? wouldn't you have been backing? wouldn't they have been backing?