can restack
Regular verb: restack - restacked- restacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can restack
you can restack
he can restack
we can restack
you can restack
they can restack 	I can be restacking
you can be restacking
he can be restacking
we can be restacking
you can be restacking
they can be restacking	I can have restacked
you can have restacked
he 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
he 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 can't restack
you can't restack
he can't restack
we can't restack
you can't restack
they can't restack 	I can't be restacking
you can't be restacking
he can't be restacking
we can't be restacking
you can't be restacking
they can't be restacking	I can't have restacked
you can't have restacked
he can't have restacked
we can't have restacked
you can't have restacked
they can't have restacked	I can't have been restacking
you can't have been restacking
he can't have been restacking
we can't have been restacking
you can't have been restacking
they can't have been restacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I restack?
can you restack?
can he restack?
can we restack?
can you restack?
can they restack? 	can I be restacking?
can you be restacking?
can he be restacking?
can we be restacking?
can you be restacking?
can they be restacking? 	can I have restacked?
can you have restacked?
can he 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 he 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't I restack?
can't you restack?
can't he restack?
can't we restack?
can't you restack?
can't they restack? 	can't I be restacking?
can't you be restacking?
can't he be restacking?
can't we be restacking?
can't you be restacking?
can't they be restacking? 	can't I have restacked?
can't you have restacked?
can't he have restacked?
can't we have restacked?
can't you have restacked?
can't they have restacked? 	can't I have been restacking?
can't you have been restacking?
can't he have been restacking?
can't we have been restacking?
can't you have been restacking?
can't they have been restacking?