may yawn
Regular verb: yawn - yawned- yawned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may yawn
you may yawn
she may yawn
we may yawn
you may yawn
they may yawn 	I may be yawning
you may be yawning
she may be yawning
we may be yawning
you may be yawning
they may be yawning	I may have yawned
you may have yawned
she may have yawned
we may have yawned
you may have yawned
they may have yawned	I may have been yawning
you may have been yawning
she may have been yawning
we may have been yawning
you may have been yawning
they may have been yawning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't yawn
you mayn't yawn
she mayn't yawn
we mayn't yawn
you mayn't yawn
they mayn't yawn 	I mayn't be yawning
you mayn't be yawning
she mayn't be yawning
we mayn't be yawning
you mayn't be yawning
they mayn't be yawning	I mayn't have yawned
you mayn't have yawned
she mayn't have yawned
we mayn't have yawned
you mayn't have yawned
they mayn't have yawned	I mayn't have been yawning
you mayn't have been yawning
she mayn't have been yawning
we mayn't have been yawning
you mayn't have been yawning
they mayn't have been yawning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I yawn?
may you yawn?
may she yawn?
may we yawn?
may you yawn?
may they yawn? 	may I be yawning?
may you be yawning?
may she be yawning?
may we be yawning?
may you be yawning?
may they be yawning? 	may I have yawned?
may you have yawned?
may she have yawned?
may we have yawned?
may you have yawned?
may they have yawned? 	may I have been yawning?
may you have been yawning?
may she have been yawning?
may we have been yawning?
may you have been yawning?
may they have been yawning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I yawn?
mayn't you yawn?
mayn't she yawn?
mayn't we yawn?
mayn't you yawn?
mayn't they yawn? 	mayn't I be yawning?
mayn't you be yawning?
mayn't she be yawning?
mayn't we be yawning?
mayn't you be yawning?
mayn't they be yawning? 	mayn't I have yawned?
mayn't you have yawned?
mayn't she have yawned?
mayn't we have yawned?
mayn't you have yawned?
mayn't they have yawned? 	mayn't I have been yawning?
mayn't you have been yawning?
mayn't she have been yawning?
mayn't we have been yawning?
mayn't you have been yawning?
mayn't they have been yawning?