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