English verb conjugation
MAY STEM

Regular verb: stem - stemmed - stemmed

Affirmation

Simple form	V-ing form
I may stem you may stem she may stem we may stem you may stem they may stem	I may be stemming you may be stemming she may be stemming we may be stemming you may be stemming they may be stemming
Perfect	V-ing perfect
I may have stemmed you may have stemmed she may have stemmed we may have stemmed you may have stemmed they may have stemmed	I may have been stemming you may have been stemming she may have been stemming we may have been stemming you may have been stemming they may have been stemming

Negation

Simple form	V-ing form
I may not stem you may not stem she may not stem we may not stem you may not stem they may not stem	I may not be stemming you may not be stemming she may not be stemming we may not be stemming you may not be stemming they may not be stemming
Perfect	V-ing perfect
I may not have stemmed you may not have stemmed she may not have stemmed we may not have stemmed you may not have stemmed they may not have stemmed	I may not have been stemming you may not have been stemming she may not have been stemming we may not have been stemming you may not have been stemming they may not have been stemming

Interrogative form

Simple form	V-ing form
may I stem? may you stem? may she stem? may we stem? may you stem? may they stem?	may I be stemming? may you be stemming? may she be stemming? may we be stemming? may you be stemming? may they be stemming?
Perfect	V-ing perfect
may I have stemmed? may you have stemmed? may she have stemmed? may we have stemmed? may you have stemmed? may they have stemmed?	may I have been stemming? may you have been stemming? may she have been stemming? may we have been stemming? may you have been stemming? may they have been stemming?

Interro-negative form

Simple form	V-ing form
may I not stem? may you not stem? may she not stem? may we not stem? may you not stem? may they not stem?	may I not be stemming? may you not be stemming? may she not be stemming? may we not be stemming? may you not be stemming? may they not be stemming?
Perfect	V-ing perfect
may I not have stemmed? may you not have stemmed? may she not have stemmed? may we not have stemmed? may you not have stemmed? may they not have stemmed?	may I not have been stemming? may you not have been stemming? may she not have been stemming? may we not have been stemming? may you not have been stemming? may they not have been stemming?