English verb conjugation
MAY YACK

Regular verb: yack - yacked - yacked

Affirmation

Simple form	V-ing form
I may yack you may yack he may yack we may yack you may yack they may yack	I may be yacking you may be yacking he may be yacking we may be yacking you may be yacking they may be yacking
Perfect	V-ing perfect
I may have yacked you may have yacked he may have yacked we may have yacked you may have yacked they may have yacked	I may have been yacking you may have been yacking he may have been yacking we may have been yacking you may have been yacking they may have been yacking

Negation

Simple form	V-ing form
I mayn't yack you mayn't yack he mayn't yack we mayn't yack you mayn't yack they mayn't yack	I mayn't be yacking you mayn't be yacking he mayn't be yacking we mayn't be yacking you mayn't be yacking they mayn't be yacking
Perfect	V-ing perfect
I mayn't have yacked you mayn't have yacked he mayn't have yacked we mayn't have yacked you mayn't have yacked they mayn't have yacked	I mayn't have been yacking you mayn't have been yacking he mayn't have been yacking we mayn't have been yacking you mayn't have been yacking they mayn't have been yacking

Interrogative form

Simple form	V-ing form
may I yack? may you yack? may he yack? may we yack? may you yack? may they yack?	may I be yacking? may you be yacking? may he be yacking? may we be yacking? may you be yacking? may they be yacking?
Perfect	V-ing perfect
may I have yacked? may you have yacked? may he have yacked? may we have yacked? may you have yacked? may they have yacked?	may I have been yacking? may you have been yacking? may he have been yacking? may we have been yacking? may you have been yacking? may they have been yacking?

Interro-negative form

Simple form	V-ing form
mayn't I yack? mayn't you yack? mayn't he yack? mayn't we yack? mayn't you yack? mayn't they yack?	mayn't I be yacking? mayn't you be yacking? mayn't he be yacking? mayn't we be yacking? mayn't you be yacking? mayn't they be yacking?
Perfect	V-ing perfect
mayn't I have yacked? mayn't you have yacked? mayn't he have yacked? mayn't we have yacked? mayn't you have yacked? mayn't they have yacked?	mayn't I have been yacking? mayn't you have been yacking? mayn't he have been yacking? mayn't we have been yacking? mayn't you have been yacking? mayn't they have been yacking?