can restack
Regular verb: restack - restacked- restacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can restack
you can restack
she can restack
we can restack
you can restack
they can restack 	I can be restacking
you can be restacking
she can be restacking
we can be restacking
you can be restacking
they can be restacking	I can have restacked
you can have restacked
she can have restacked
we can have restacked
you can have restacked
they can have restacked	I can have been restacking
you can have been restacking
she can have been restacking
we can have been restacking
you can have been restacking
they can have been restacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot restack
you cannot restack
she cannot restack
we cannot restack
you cannot restack
they cannot restack 	I cannot be restacking
you cannot be restacking
she cannot be restacking
we cannot be restacking
you cannot be restacking
they cannot be restacking	I cannot have restacked
you cannot have restacked
she cannot have restacked
we cannot have restacked
you cannot have restacked
they cannot have restacked	I cannot have been restacking
you cannot have been restacking
she cannot have been restacking
we cannot have been restacking
you cannot have been restacking
they cannot have been restacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I restack?
can you restack?
can she restack?
can we restack?
can you restack?
can they restack? 	can I be restacking?
can you be restacking?
can she be restacking?
can we be restacking?
can you be restacking?
can they be restacking? 	can I have restacked?
can you have restacked?
can she have restacked?
can we have restacked?
can you have restacked?
can they have restacked? 	can I have been restacking?
can you have been restacking?
can she have been restacking?
can we have been restacking?
can you have been restacking?
can they have been restacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not restack?
can you not restack?
can she not restack?
can we not restack?
can you not restack?
can they not restack? 	can I not be restacking?
can you not be restacking?
can she not be restacking?
can we not be restacking?
can you not be restacking?
can they not be restacking? 	can I not have restacked?
can you not have restacked?
can she not have restacked?
can we not have restacked?
can you not have restacked?
can they not have restacked? 	can I not have been restacking?
can you not have been restacking?
can she not have been restacking?
can we not have been restacking?
can you not have been restacking?
can they not have been restacking?