may thumb
Regular verb: thumb - thumbed- thumbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may thumb
you may thumb
she may thumb
we may thumb
you may thumb
they may thumb 	I may be thumbing
you may be thumbing
she may be thumbing
we may be thumbing
you may be thumbing
they may be thumbing	I may have thumbed
you may have thumbed
she may have thumbed
we may have thumbed
you may have thumbed
they may have thumbed	I may have been thumbing
you may have been thumbing
she may have been thumbing
we may have been thumbing
you may have been thumbing
they may have been thumbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't thumb
you mayn't thumb
she mayn't thumb
we mayn't thumb
you mayn't thumb
they mayn't thumb 	I mayn't be thumbing
you mayn't be thumbing
she mayn't be thumbing
we mayn't be thumbing
you mayn't be thumbing
they mayn't be thumbing	I mayn't have thumbed
you mayn't have thumbed
she mayn't have thumbed
we mayn't have thumbed
you mayn't have thumbed
they mayn't have thumbed	I mayn't have been thumbing
you mayn't have been thumbing
she mayn't have been thumbing
we mayn't have been thumbing
you mayn't have been thumbing
they mayn't have been thumbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I thumb?
may you thumb?
may she thumb?
may we thumb?
may you thumb?
may they thumb? 	may I be thumbing?
may you be thumbing?
may she be thumbing?
may we be thumbing?
may you be thumbing?
may they be thumbing? 	may I have thumbed?
may you have thumbed?
may she have thumbed?
may we have thumbed?
may you have thumbed?
may they have thumbed? 	may I have been thumbing?
may you have been thumbing?
may she have been thumbing?
may we have been thumbing?
may you have been thumbing?
may they have been thumbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I thumb?
mayn't you thumb?
mayn't she thumb?
mayn't we thumb?
mayn't you thumb?
mayn't they thumb? 	mayn't I be thumbing?
mayn't you be thumbing?
mayn't she be thumbing?
mayn't we be thumbing?
mayn't you be thumbing?
mayn't they be thumbing? 	mayn't I have thumbed?
mayn't you have thumbed?
mayn't she have thumbed?
mayn't we have thumbed?
mayn't you have thumbed?
mayn't they have thumbed? 	mayn't I have been thumbing?
mayn't you have been thumbing?
mayn't she have been thumbing?
mayn't we have been thumbing?
mayn't you have been thumbing?
mayn't they have been thumbing?