may upturn
Regular verb: upturn - upturned- upturned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may upturn
you may upturn
he may upturn
we may upturn
you may upturn
they may upturn 	I may be upturning
you may be upturning
he may be upturning
we may be upturning
you may be upturning
they may be upturning	I may have upturned
you may have upturned
he may have upturned
we may have upturned
you may have upturned
they may have upturned	I may have been upturning
you may have been upturning
he may have been upturning
we may have been upturning
you may have been upturning
they may have been upturning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't upturn
you mayn't upturn
he mayn't upturn
we mayn't upturn
you mayn't upturn
they mayn't upturn 	I mayn't be upturning
you mayn't be upturning
he mayn't be upturning
we mayn't be upturning
you mayn't be upturning
they mayn't be upturning	I mayn't have upturned
you mayn't have upturned
he mayn't have upturned
we mayn't have upturned
you mayn't have upturned
they mayn't have upturned	I mayn't have been upturning
you mayn't have been upturning
he mayn't have been upturning
we mayn't have been upturning
you mayn't have been upturning
they mayn't have been upturning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I upturn?
may you upturn?
may he upturn?
may we upturn?
may you upturn?
may they upturn? 	may I be upturning?
may you be upturning?
may he be upturning?
may we be upturning?
may you be upturning?
may they be upturning? 	may I have upturned?
may you have upturned?
may he have upturned?
may we have upturned?
may you have upturned?
may they have upturned? 	may I have been upturning?
may you have been upturning?
may he have been upturning?
may we have been upturning?
may you have been upturning?
may they have been upturning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I upturn?
mayn't you upturn?
mayn't he upturn?
mayn't we upturn?
mayn't you upturn?
mayn't they upturn? 	mayn't I be upturning?
mayn't you be upturning?
mayn't he be upturning?
mayn't we be upturning?
mayn't you be upturning?
mayn't they be upturning? 	mayn't I have upturned?
mayn't you have upturned?
mayn't he have upturned?
mayn't we have upturned?
mayn't you have upturned?
mayn't they have upturned? 	mayn't I have been upturning?
mayn't you have been upturning?
mayn't he have been upturning?
mayn't we have been upturning?
mayn't you have been upturning?
mayn't they have been upturning?