don't I stack? don't you stack? doesn't he stack? don't we stack? don't you stack? don't they stack?
Presente contínuo
am I not stacking? aren't you stacking? isn't he stacking? aren't we stacking? aren't you stacking? aren't they stacking?
Pretérito
didn't I stack? didn't you stack? didn't he stack? didn't we stack? didn't you stack? didn't they stack?
Preterito contínuo
wasn't I stacking? weren't you stacking? wasn't he stacking? weren't we stacking? weren't you stacking? weren't they stacking?
Presente perfeito
haven't I stacked? haven't you stacked? hasn't he stacked? haven't we stacked? haven't you stacked? haven't they stacked?
Presente perfeito contínuo
haven't I been stacking? haven't you been stacking? hasn't he been stacking? haven't we been stacking? haven't you been stacking? haven't they been stacking?
Mais perfeito
hadn't I stacked? hadn't you stacked? hadn't he stacked? hadn't we stacked? hadn't you stacked? hadn't they stacked?
Contínuo mais perfeito
hadn't I been stacking? hadn't you been stacking? hadn't he been stacking? hadn't we been stacking? hadn't you been stacking? hadn't they been stacking?
Futuro
won't I stack? won't you stack? won't he stack? won't we stack? won't you stack? won't they stack?
Futuro contínuo
won't I be stacking? won't you be stacking? won't he be stacking? won't we be stacking? won't you be stacking? won't they be stacking?
futuro perfeito
won't I have stacked? won't you have stacked? won't he have stacked? won't we have stacked? won't you have stacked? won't they have stacked?
futuro perfeito contínuo
won't I have been stacking? won't you have been stacking? won't he have been stacking? won't we have been stacking? won't you have been stacking? won't they have been stacking?
Condicional
Presente
wouldn't I stack? wouldn't you stack? wouldn't he stack? wouldn't we stack? wouldn't you stack? wouldn't they stack?
Presente contínuo
wouldn't I be stacking? wouldn't you be stacking? wouldn't he be stacking? wouldn't we be stacking? wouldn't you be stacking? wouldn't they be stacking?
Passado
wouldn't I have stacked? wouldn't you have stacked? wouldn't he have stacked? wouldn't we have stacked? wouldn't you have stacked? wouldn't they have stacked?
Passado contínuo
wouldn't I have been stacking? wouldn't you have been stacking? wouldn't he have been stacking? wouldn't we have been stacking? wouldn't you have been stacking? wouldn't they have been stacking?