do I stack? do you stack? does she stack? do we stack? do you stack? do they stack?
Presente contínuo
am I stacking? are you stacking? is she stacking? are we stacking? are you stacking? are they stacking?
Pretérito
did I stack? did you stack? did she stack? did we stack? did you stack? did they stack?
Preterito contínuo
was I stacking? were you stacking? was she stacking? were we stacking? were you stacking? were they stacking?
Presente perfeito
have I stacked? have you stacked? has she stacked? have we stacked? have you stacked? have they stacked?
Presente perfeito contínuo
have I been stacking? have you been stacking? has she been stacking? have we been stacking? have you been stacking? have they been stacking?
Mais perfeito
had I stacked? had you stacked? had she stacked? had we stacked? had you stacked? had they stacked?
Contínuo mais perfeito
had I been stacking? had you been stacking? had she been stacking? had we been stacking? had you been stacking? had they been stacking?
Futuro
will I stack? will you stack? will she stack? will we stack? will you stack? will they stack?
Futuro contínuo
will I be stacking? will you be stacking? will she be stacking? will we be stacking? will you be stacking? will they be stacking?
futuro perfeito
will I have stacked? will you have stacked? will she have stacked? will we have stacked? will you have stacked? will they have stacked?
futuro perfeito contínuo
will I have been stacking? will you have been stacking? will she have been stacking? will we have been stacking? will you have been stacking? will they have been stacking?
Condicional
Presente
would I stack? would you stack? would she stack? would we stack? would you stack? would they stack?
Presente contínuo
would I be stacking? would you be stacking? would she be stacking? would we be stacking? would you be stacking? would they be stacking?
Passado
would I have stacked? would you have stacked? would she have stacked? would we have stacked? would you have stacked? would they have stacked?
Passado contínuo
would I have been stacking? would you have been stacking? would she have been stacking? would we have been stacking? would you have been stacking? would they have been stacking?