do I not stack? do you not stack? does she not stack? do we not stack? do you not stack? do they not stack?
Present continuous
am I not stacking? are you not stacking? is she not stacking? are we not stacking? are you not stacking? are they not stacking?
Preterite
did I not stack? did you not stack? did she not stack? did we not stack? did you not stack? did they not stack?
Preterite continuous
was I not stacking? were you not stacking? was she not stacking? were we not stacking? were you not stacking? were they not stacking?
Present perfect
have I not stacked? have you not stacked? has she not stacked? have we not stacked? have you not stacked? have they not stacked?
Present perfect continuous
have I not been stacking? have you not been stacking? has she not been stacking? have we not been stacking? have you not been stacking? have they not been stacking?
Pluperfect
had I not stacked? had you not stacked? had she not stacked? had we not stacked? had you not stacked? had they not stacked?
Pluperfect continuous
had I not been stacking? had you not been stacking? had she not been stacking? had we not been stacking? had you not been stacking? had they not been stacking?
Future
will I not stack? will you not stack? will she not stack? will we not stack? will you not stack? will they not stack?
Future continuous
will I not be stacking? will you not be stacking? will she not be stacking? will we not be stacking? will you not be stacking? will they not be stacking?
Future perfect
will I not have stacked? will you not have stacked? will she not have stacked? will we not have stacked? will you not have stacked? will they not have stacked?
Future perfect continuous
will I not have been stacking? will you not have been stacking? will she not have been stacking? will we not have been stacking? will you not have been stacking? will they not have been stacking?
Conditional
Present
would I not stack? would you not stack? would she not stack? would we not stack? would you not stack? would they not stack?
Present continuous
would I not be stacking? would you not be stacking? would she not be stacking? would we not be stacking? would you not be stacking? would they not be stacking?
Past
would I not have stacked? would you not have stacked? would she not have stacked? would we not have stacked? would you not have stacked? would they not have stacked?
Past continuous
would I not have been stacking? would you not have been stacking? would she not have been stacking? would we not have been stacking? would you not have been stacking? would they not have been stacking?