may restack
Regular verb: restack - restacked- restacked

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not restack
you may not restack
he may not restack
we may not restack
you may not restack
they may not restack 	I may not be restacking
you may not be restacking
he may not be restacking
we may not be restacking
you may not be restacking
they may not be restacking	I may not have restacked
you may not have restacked
he may not have restacked
we may not have restacked
you may not have restacked
they may not have restacked	I may not have been restacking
you may not have been restacking
he may not have been restacking
we may not have been restacking
you may not have been restacking
they may not have been restacking	

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

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