English verb conjugation
MAY YAWN

Regular verb: yawn - yawned - yawned

Affirmation

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