may flatten
Regular verb: flatten - flattened- flattened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may flatten
you may flatten
she may flatten
we may flatten
you may flatten
they may flatten 	I may be flattening
you may be flattening
she may be flattening
we may be flattening
you may be flattening
they may be flattening	I may have flattened
you may have flattened
she may have flattened
we may have flattened
you may have flattened
they may have flattened	I may have been flattening
you may have been flattening
she may have been flattening
we may have been flattening
you may have been flattening
they may have been flattening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't flatten
you mayn't flatten
she mayn't flatten
we mayn't flatten
you mayn't flatten
they mayn't flatten 	I mayn't be flattening
you mayn't be flattening
she mayn't be flattening
we mayn't be flattening
you mayn't be flattening
they mayn't be flattening	I mayn't have flattened
you mayn't have flattened
she mayn't have flattened
we mayn't have flattened
you mayn't have flattened
they mayn't have flattened	I mayn't have been flattening
you mayn't have been flattening
she mayn't have been flattening
we mayn't have been flattening
you mayn't have been flattening
they mayn't have been flattening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I flatten?
may you flatten?
may she flatten?
may we flatten?
may you flatten?
may they flatten? 	may I be flattening?
may you be flattening?
may she be flattening?
may we be flattening?
may you be flattening?
may they be flattening? 	may I have flattened?
may you have flattened?
may she have flattened?
may we have flattened?
may you have flattened?
may they have flattened? 	may I have been flattening?
may you have been flattening?
may she have been flattening?
may we have been flattening?
may you have been flattening?
may they have been flattening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I flatten?
mayn't you flatten?
mayn't she flatten?
mayn't we flatten?
mayn't you flatten?
mayn't they flatten? 	mayn't I be flattening?
mayn't you be flattening?
mayn't she be flattening?
mayn't we be flattening?
mayn't you be flattening?
mayn't they be flattening? 	mayn't I have flattened?
mayn't you have flattened?
mayn't she have flattened?
mayn't we have flattened?
mayn't you have flattened?
mayn't they have flattened? 	mayn't I have been flattening?
mayn't you have been flattening?
mayn't she have been flattening?
mayn't we have been flattening?
mayn't you have been flattening?
mayn't they have been flattening?