Indicative
Present Indefinite
I stack up
you stack up
he/she/it stacks up
we stack up
you stack up
they stack up
Present Continuous
I am stacking up
you are stacking up
he/she/it is stacking up
we are stacking up
you are stacking up
they are stacking up
Present Perfect
I have stacked up
you have stacked up
he/she/it has stacked up
we have stacked up
you have stacked up
they have stacked up
Present Perfect Continuous
I have been stacking up
you have been stacking up
he/she/it has been stacking up
we have been stacking up
you have been stacking up
they have been stacking up
Past Indefinite
I stacked up
you stacked up
he/she/it stacked up
we stacked up
you stacked up
they stacked up
Past Continuous
I was stacking up
you were stacking up
he/she/it was stacking up
we were stacking up
you were stacking up
they were stacking up
Past Perfect
I had stacked up
you had stacked up
he/she/it had stacked up
we had stacked up
you had stacked up
they had stacked up
Past Perfect Continuous
I had been stacking up
you had been stacking up
he/she/it had been stacking up
we had been stacking up
you had been stacking up
they had been stacking up
Future Indefinite
I will stack up
you will stack up
he/she/it will stack up
we will stack up
you will stack up
they will stack up
Future Continuous
I will be stacking up
you will be stacking up
he/she/it will be stacking up
we will be stacking up
you will be stacking up
they will be stacking up
Future Perfect
I will have stacked up
you will have stacked up
he/she/it will have stacked up
we will have stacked up
you will have stacked up
they will have stacked up
Future Perfect Continuous
I will have been stacking up
you will have been stacking up
he/she/it will have been stacking up
we will have been stacking up
you will have been stacking up
they will have been stacking up
Conditional
Conditional Present
I would stack up
you would stack up
he/she/it would stack up
we would stack up
you would stack up
they would stack up
Conditional Present Continuous
I would be stacking up
you would be stacking up
he/she/it would be stacking up
we would be stacking up
you would be stacking up
they would be stacking up
Conditional Perfect
I would have stacked up
you would have stacked up
he/she/it would have stacked up
we would have stacked up
you would have stacked up
they would have stacked up
Conditional Perfect Continuous
I would have been stacking up
you would have been stacking up
he/she/it would have been stacking up
we would have been stacking up
you would have been stacking up
they would have been stacking up