may overwinter
Regular verb: overwinter - overwintered- overwintered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may overwinter
you may overwinter
he may overwinter
we may overwinter
you may overwinter
they may overwinter 	I may be overwintering
you may be overwintering
he may be overwintering
we may be overwintering
you may be overwintering
they may be overwintering	I may have overwintered
you may have overwintered
he may have overwintered
we may have overwintered
you may have overwintered
they may have overwintered	I may have been overwintering
you may have been overwintering
he may have been overwintering
we may have been overwintering
you may have been overwintering
they may have been overwintering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't overwinter
you mayn't overwinter
he mayn't overwinter
we mayn't overwinter
you mayn't overwinter
they mayn't overwinter 	I mayn't be overwintering
you mayn't be overwintering
he mayn't be overwintering
we mayn't be overwintering
you mayn't be overwintering
they mayn't be overwintering	I mayn't have overwintered
you mayn't have overwintered
he mayn't have overwintered
we mayn't have overwintered
you mayn't have overwintered
they mayn't have overwintered	I mayn't have been overwintering
you mayn't have been overwintering
he mayn't have been overwintering
we mayn't have been overwintering
you mayn't have been overwintering
they mayn't have been overwintering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I overwinter?
may you overwinter?
may he overwinter?
may we overwinter?
may you overwinter?
may they overwinter? 	may I be overwintering?
may you be overwintering?
may he be overwintering?
may we be overwintering?
may you be overwintering?
may they be overwintering? 	may I have overwintered?
may you have overwintered?
may he have overwintered?
may we have overwintered?
may you have overwintered?
may they have overwintered? 	may I have been overwintering?
may you have been overwintering?
may he have been overwintering?
may we have been overwintering?
may you have been overwintering?
may they have been overwintering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I overwinter?
mayn't you overwinter?
mayn't he overwinter?
mayn't we overwinter?
mayn't you overwinter?
mayn't they overwinter? 	mayn't I be overwintering?
mayn't you be overwintering?
mayn't he be overwintering?
mayn't we be overwintering?
mayn't you be overwintering?
mayn't they be overwintering? 	mayn't I have overwintered?
mayn't you have overwintered?
mayn't he have overwintered?
mayn't we have overwintered?
mayn't you have overwintered?
mayn't they have overwintered? 	mayn't I have been overwintering?
mayn't you have been overwintering?
mayn't he have been overwintering?
mayn't we have been overwintering?
mayn't you have been overwintering?
mayn't they have been overwintering?