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 mayn't restack
you mayn't restack
he mayn't restack
we mayn't restack
you mayn't restack
they mayn't restack 	I mayn't be restacking
you mayn't be restacking
he mayn't be restacking
we mayn't be restacking
you mayn't be restacking
they mayn't be restacking	I mayn't have restacked
you mayn't have restacked
he mayn't have restacked
we mayn't have restacked
you mayn't have restacked
they mayn't have restacked	I mayn't have been restacking
you mayn't have been restacking
he mayn't have been restacking
we mayn't have been restacking
you mayn't have been restacking
they mayn't 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 	
mayn't I restack?
mayn't you restack?
mayn't he restack?
mayn't we restack?
mayn't you restack?
mayn't they restack? 	mayn't I be restacking?
mayn't you be restacking?
mayn't he be restacking?
mayn't we be restacking?
mayn't you be restacking?
mayn't they be restacking? 	mayn't I have restacked?
mayn't you have restacked?
mayn't he have restacked?
mayn't we have restacked?
mayn't you have restacked?
mayn't they have restacked? 	mayn't I have been restacking?
mayn't you have been restacking?
mayn't he have been restacking?
mayn't we have been restacking?
mayn't you have been restacking?
mayn't they have been restacking?