English verb conjugation
MAY QUACK

Regular verb: quack - quacked - quacked

Affirmation

Simple form	V-ing form
I may quack you may quack he may quack we may quack you may quack they may quack	I may be quacking you may be quacking he may be quacking we may be quacking you may be quacking they may be quacking
Perfect	V-ing perfect
I may have quacked you may have quacked he may have quacked we may have quacked you may have quacked they may have quacked	I may have been quacking you may have been quacking he may have been quacking we may have been quacking you may have been quacking they may have been quacking

Negation

Simple form	V-ing form
I mayn't quack you mayn't quack he mayn't quack we mayn't quack you mayn't quack they mayn't quack	I mayn't be quacking you mayn't be quacking he mayn't be quacking we mayn't be quacking you mayn't be quacking they mayn't be quacking
Perfect	V-ing perfect
I mayn't have quacked you mayn't have quacked he mayn't have quacked we mayn't have quacked you mayn't have quacked they mayn't have quacked	I mayn't have been quacking you mayn't have been quacking he mayn't have been quacking we mayn't have been quacking you mayn't have been quacking they mayn't have been quacking

Interrogative form

Simple form	V-ing form
may I quack? may you quack? may he quack? may we quack? may you quack? may they quack?	may I be quacking? may you be quacking? may he be quacking? may we be quacking? may you be quacking? may they be quacking?
Perfect	V-ing perfect
may I have quacked? may you have quacked? may he have quacked? may we have quacked? may you have quacked? may they have quacked?	may I have been quacking? may you have been quacking? may he have been quacking? may we have been quacking? may you have been quacking? may they have been quacking?

Interro-negative form

Simple form	V-ing form
mayn't I quack? mayn't you quack? mayn't he quack? mayn't we quack? mayn't you quack? mayn't they quack?	mayn't I be quacking? mayn't you be quacking? mayn't he be quacking? mayn't we be quacking? mayn't you be quacking? mayn't they be quacking?
Perfect	V-ing perfect
mayn't I have quacked? mayn't you have quacked? mayn't he have quacked? mayn't we have quacked? mayn't you have quacked? mayn't they have quacked?	mayn't I have been quacking? mayn't you have been quacking? mayn't he have been quacking? mayn't we have been quacking? mayn't you have been quacking? mayn't they have been quacking?