may stem
Verbo regular: stem - stemmed- stemmed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mayn't stem
you mayn't stem
she mayn't stem
we mayn't stem
you mayn't stem
they mayn't stem 	I mayn't be stemming
you mayn't be stemming
she mayn't be stemming
we mayn't be stemming
you mayn't be stemming
they mayn't be stemming	I mayn't have stemmed
you mayn't have stemmed
she mayn't have stemmed
we mayn't have stemmed
you mayn't have stemmed
they mayn't have stemmed	I mayn't have been stemming
you mayn't have been stemming
she mayn't have been stemming
we mayn't have been stemming
you mayn't have been stemming
they mayn't have been stemming	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mayn't I stem?
mayn't you stem?
mayn't she stem?
mayn't we stem?
mayn't you stem?
mayn't they stem? 	mayn't I be stemming?
mayn't you be stemming?
mayn't she be stemming?
mayn't we be stemming?
mayn't you be stemming?
mayn't they be stemming? 	mayn't I have stemmed?
mayn't you have stemmed?
mayn't she have stemmed?
mayn't we have stemmed?
mayn't you have stemmed?
mayn't they have stemmed? 	mayn't I have been stemming?
mayn't you have been stemming?
mayn't she have been stemming?
mayn't we have been stemming?
mayn't you have been stemming?
mayn't they have been stemming?