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 may not flatten
you may not flatten
she may not flatten
we may not flatten
you may not flatten
they may not flatten 	I may not be flattening
you may not be flattening
she may not be flattening
we may not be flattening
you may not be flattening
they may not be flattening	I may not have flattened
you may not have flattened
she may not have flattened
we may not have flattened
you may not have flattened
they may not have flattened	I may not have been flattening
you may not have been flattening
she may not have been flattening
we may not have been flattening
you may not have been flattening
they may not 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 	
may I not flatten?
may you not flatten?
may she not flatten?
may we not flatten?
may you not flatten?
may they not flatten? 	may I not be flattening?
may you not be flattening?
may she not be flattening?
may we not be flattening?
may you not be flattening?
may they not be flattening? 	may I not have flattened?
may you not have flattened?
may she not have flattened?
may we not have flattened?
may you not have flattened?
may they not have flattened? 	may I not have been flattening?
may you not have been flattening?
may she not have been flattening?
may we not have been flattening?
may you not have been flattening?
may they not have been flattening?