may yawn
Regular verb: yawn - yawned- yawned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may yawn
you may yawn
he may yawn
we may yawn
you may yawn
they may yawn 	I may be yawning
you may be yawning
he may be yawning
we may be yawning
you may be yawning
they may be yawning	I may have yawned
you may have yawned
he 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
he 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 may not yawn
you may not yawn
he may not yawn
we may not yawn
you may not yawn
they may not yawn 	I may not be yawning
you may not be yawning
he may not be yawning
we may not be yawning
you may not be yawning
they may not be yawning	I may not have yawned
you may not have yawned
he may not have yawned
we may not have yawned
you may not have yawned
they may not have yawned	I may not have been yawning
you may not have been yawning
he may not have been yawning
we may not have been yawning
you may not have been yawning
they may not have been yawning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I yawn?
may you yawn?
may he yawn?
may we yawn?
may you yawn?
may they yawn? 	may I be yawning?
may you be yawning?
may he be yawning?
may we be yawning?
may you be yawning?
may they be yawning? 	may I have yawned?
may you have yawned?
may he 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 he 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 	
may I not yawn?
may you not yawn?
may he not yawn?
may we not yawn?
may you not yawn?
may they not yawn? 	may I not be yawning?
may you not be yawning?
may he not be yawning?
may we not be yawning?
may you not be yawning?
may they not be yawning? 	may I not have yawned?
may you not have yawned?
may he not have yawned?
may we not have yawned?
may you not have yawned?
may they not have yawned? 	may I not have been yawning?
may you not have been yawning?
may he not have been yawning?
may we not have been yawning?
may you not have been yawning?
may they not have been yawning?