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 may not quack you may not quack he may not quack we may not quack you may not quack they may not quack	I may not be quacking you may not be quacking he may not be quacking we may not be quacking you may not be quacking they may not be quacking
Perfect	V-ing perfect
I may not have quacked you may not have quacked he may not have quacked we may not have quacked you may not have quacked they may not have quacked	I may not have been quacking you may not have been quacking he may not have been quacking we may not have been quacking you may not have been quacking they may not 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
may I not quack? may you not quack? may he not quack? may we not quack? may you not quack? may they not quack?	may I not be quacking? may you not be quacking? may he not be quacking? may we not be quacking? may you not be quacking? may they not be quacking?
Perfect	V-ing perfect
may I not have quacked? may you not have quacked? may he not have quacked? may we not have quacked? may you not have quacked? may they not have quacked?	may I not have been quacking? may you not have been quacking? may he not have been quacking? may we not have been quacking? may you not have been quacking? may they not have been quacking?