may stain
Regular verb: stain - stained- stained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may stain
you may stain
she may stain
we may stain
you may stain
they may stain 	I may be staining
you may be staining
she may be staining
we may be staining
you may be staining
they may be staining	I may have stained
you may have stained
she may have stained
we may have stained
you may have stained
they may have stained	I may have been staining
you may have been staining
she may have been staining
we may have been staining
you may have been staining
they may have been staining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't stain
you mayn't stain
she mayn't stain
we mayn't stain
you mayn't stain
they mayn't stain 	I mayn't be staining
you mayn't be staining
she mayn't be staining
we mayn't be staining
you mayn't be staining
they mayn't be staining	I mayn't have stained
you mayn't have stained
she mayn't have stained
we mayn't have stained
you mayn't have stained
they mayn't have stained	I mayn't have been staining
you mayn't have been staining
she mayn't have been staining
we mayn't have been staining
you mayn't have been staining
they mayn't have been staining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I stain?
may you stain?
may she stain?
may we stain?
may you stain?
may they stain? 	may I be staining?
may you be staining?
may she be staining?
may we be staining?
may you be staining?
may they be staining? 	may I have stained?
may you have stained?
may she have stained?
may we have stained?
may you have stained?
may they have stained? 	may I have been staining?
may you have been staining?
may she have been staining?
may we have been staining?
may you have been staining?
may they have been staining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I stain?
mayn't you stain?
mayn't she stain?
mayn't we stain?
mayn't you stain?
mayn't they stain? 	mayn't I be staining?
mayn't you be staining?
mayn't she be staining?
mayn't we be staining?
mayn't you be staining?
mayn't they be staining? 	mayn't I have stained?
mayn't you have stained?
mayn't she have stained?
mayn't we have stained?
mayn't you have stained?
mayn't they have stained? 	mayn't I have been staining?
mayn't you have been staining?
mayn't she have been staining?
mayn't we have been staining?
mayn't you have been staining?
mayn't they have been staining?