may clump
Regular verb: clump - clumped- clumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may clump
you may clump
she may clump
we may clump
you may clump
they may clump 	I may be clumping
you may be clumping
she may be clumping
we may be clumping
you may be clumping
they may be clumping	I may have clumped
you may have clumped
she may have clumped
we may have clumped
you may have clumped
they may have clumped	I may have been clumping
you may have been clumping
she may have been clumping
we may have been clumping
you may have been clumping
they may have been clumping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't clump
you mayn't clump
she mayn't clump
we mayn't clump
you mayn't clump
they mayn't clump 	I mayn't be clumping
you mayn't be clumping
she mayn't be clumping
we mayn't be clumping
you mayn't be clumping
they mayn't be clumping	I mayn't have clumped
you mayn't have clumped
she mayn't have clumped
we mayn't have clumped
you mayn't have clumped
they mayn't have clumped	I mayn't have been clumping
you mayn't have been clumping
she mayn't have been clumping
we mayn't have been clumping
you mayn't have been clumping
they mayn't have been clumping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I clump?
may you clump?
may she clump?
may we clump?
may you clump?
may they clump? 	may I be clumping?
may you be clumping?
may she be clumping?
may we be clumping?
may you be clumping?
may they be clumping? 	may I have clumped?
may you have clumped?
may she have clumped?
may we have clumped?
may you have clumped?
may they have clumped? 	may I have been clumping?
may you have been clumping?
may she have been clumping?
may we have been clumping?
may you have been clumping?
may they have been clumping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I clump?
mayn't you clump?
mayn't she clump?
mayn't we clump?
mayn't you clump?
mayn't they clump? 	mayn't I be clumping?
mayn't you be clumping?
mayn't she be clumping?
mayn't we be clumping?
mayn't you be clumping?
mayn't they be clumping? 	mayn't I have clumped?
mayn't you have clumped?
mayn't she have clumped?
mayn't we have clumped?
mayn't you have clumped?
mayn't they have clumped? 	mayn't I have been clumping?
mayn't you have been clumping?
mayn't she have been clumping?
mayn't we have been clumping?
mayn't you have been clumping?
mayn't they have been clumping?