stack - Conjugation of the English verb stack
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to stack up - empiler  
 
Indicative
Present Perfect
I stack up
you stack up
he stacks up
we stack up
they stack up
I have stacked up
you have stacked up
he has stacked up
we have stacked up
they have stacked up
Past Pluperfect
I stacked up
you stacked up
he stacked up
we stacked up
they stacked up
I had stacked up
you had stacked up
he had stacked up
we had stacked up
they had stacked up
Future Future perfect
I will stack up
you will stack up
he will stack up
we will stack up
they will stack up
I will have stacked up
you will have stacked up
he will have stacked up
we will have stacked up
they will have stacked up
Imperative
Present    
stack up!
let's stack up!
 
 
Conditional
Present Perfect
I would stack up
you would stack up
he would stack up
we would stack up
they would stack up
I would have stacked up
you would have stacked up
he would have stacked up
we would have stacked up
they would have stacked up
Conjunctive
Present Perfect
I stack up
you stack up
he stack up
we stack up
they stack up
I have stacked up
you have stacked up
he have stacked up
we have stacked up
they have stacked up
Past   Pluperfect  
I stacked up
you stacked up
he stacked up
we stacked up
they stacked up
I had stacked up
you had stacked up
he had stacked up
we had stacked up
they had stacked up
Participle
Gerund Past
stacking up
stacked up