may nibble
Regular verb: nibble - nibbled- nibbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may nibble
you may nibble
she may nibble
we may nibble
you may nibble
they may nibble 	I may be nibbling
you may be nibbling
she may be nibbling
we may be nibbling
you may be nibbling
they may be nibbling	I may have nibbled
you may have nibbled
she may have nibbled
we may have nibbled
you may have nibbled
they may have nibbled	I may have been nibbling
you may have been nibbling
she may have been nibbling
we may have been nibbling
you may have been nibbling
they may have been nibbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't nibble
you mayn't nibble
she mayn't nibble
we mayn't nibble
you mayn't nibble
they mayn't nibble 	I mayn't be nibbling
you mayn't be nibbling
she mayn't be nibbling
we mayn't be nibbling
you mayn't be nibbling
they mayn't be nibbling	I mayn't have nibbled
you mayn't have nibbled
she mayn't have nibbled
we mayn't have nibbled
you mayn't have nibbled
they mayn't have nibbled	I mayn't have been nibbling
you mayn't have been nibbling
she mayn't have been nibbling
we mayn't have been nibbling
you mayn't have been nibbling
they mayn't have been nibbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I nibble?
may you nibble?
may she nibble?
may we nibble?
may you nibble?
may they nibble? 	may I be nibbling?
may you be nibbling?
may she be nibbling?
may we be nibbling?
may you be nibbling?
may they be nibbling? 	may I have nibbled?
may you have nibbled?
may she have nibbled?
may we have nibbled?
may you have nibbled?
may they have nibbled? 	may I have been nibbling?
may you have been nibbling?
may she have been nibbling?
may we have been nibbling?
may you have been nibbling?
may they have been nibbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I nibble?
mayn't you nibble?
mayn't she nibble?
mayn't we nibble?
mayn't you nibble?
mayn't they nibble? 	mayn't I be nibbling?
mayn't you be nibbling?
mayn't she be nibbling?
mayn't we be nibbling?
mayn't you be nibbling?
mayn't they be nibbling? 	mayn't I have nibbled?
mayn't you have nibbled?
mayn't she have nibbled?
mayn't we have nibbled?
mayn't you have nibbled?
mayn't they have nibbled? 	mayn't I have been nibbling?
mayn't you have been nibbling?
mayn't she have been nibbling?
mayn't we have been nibbling?
mayn't you have been nibbling?
mayn't they have been nibbling?