will stack
Regular verb: stack - stacked- stacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I will stack
you will stack
she will stack
we will stack
you will stack
they will stack 	I will be stacking
you will be stacking
she will be stacking
we will be stacking
you will be stacking
they will be stacking	I will have stacked
you will have stacked
she will have stacked
we will have stacked
you will have stacked
they will have stacked	I will have been stacking
you will have been stacking
she will have been stacking
we will have been stacking
you will have been stacking
they will have been stacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I will not stack
you will not stack
she will not stack
we will not stack
you will not stack
they will not stack 	I will not be stacking
you will not be stacking
she will not be stacking
we will not be stacking
you will not be stacking
they will not be stacking	I will not have stacked
you will not have stacked
she will not have stacked
we will not have stacked
you will not have stacked
they will not have stacked	I will not have been stacking
you will not have been stacking
she will not have been stacking
we will not have been stacking
you will not have been stacking
they will not have been stacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
will I stack?
will you stack?
will she stack?
will we stack?
will you stack?
will they stack? 	will I be stacking?
will you be stacking?
will she be stacking?
will we be stacking?
will you be stacking?
will they be stacking? 	will I have stacked?
will you have stacked?
will she have stacked?
will we have stacked?
will you have stacked?
will they have stacked? 	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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
will I not stack?
will you not stack?
will she not stack?
will we not stack?
will you not stack?
will they not stack? 	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? 	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? 	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?