may grabble
Regular verb: grabble - grabbled- grabbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may grabble
you may grabble
he may grabble
we may grabble
you may grabble
they may grabble 	I may be grabbling
you may be grabbling
he may be grabbling
we may be grabbling
you may be grabbling
they may be grabbling	I may have grabbled
you may have grabbled
he may have grabbled
we may have grabbled
you may have grabbled
they may have grabbled	I may have been grabbling
you may have been grabbling
he may have been grabbling
we may have been grabbling
you may have been grabbling
they may have been grabbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't grabble
you mayn't grabble
he mayn't grabble
we mayn't grabble
you mayn't grabble
they mayn't grabble 	I mayn't be grabbling
you mayn't be grabbling
he mayn't be grabbling
we mayn't be grabbling
you mayn't be grabbling
they mayn't be grabbling	I mayn't have grabbled
you mayn't have grabbled
he mayn't have grabbled
we mayn't have grabbled
you mayn't have grabbled
they mayn't have grabbled	I mayn't have been grabbling
you mayn't have been grabbling
he mayn't have been grabbling
we mayn't have been grabbling
you mayn't have been grabbling
they mayn't have been grabbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I grabble?
may you grabble?
may he grabble?
may we grabble?
may you grabble?
may they grabble? 	may I be grabbling?
may you be grabbling?
may he be grabbling?
may we be grabbling?
may you be grabbling?
may they be grabbling? 	may I have grabbled?
may you have grabbled?
may he have grabbled?
may we have grabbled?
may you have grabbled?
may they have grabbled? 	may I have been grabbling?
may you have been grabbling?
may he have been grabbling?
may we have been grabbling?
may you have been grabbling?
may they have been grabbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I grabble?
mayn't you grabble?
mayn't he grabble?
mayn't we grabble?
mayn't you grabble?
mayn't they grabble? 	mayn't I be grabbling?
mayn't you be grabbling?
mayn't he be grabbling?
mayn't we be grabbling?
mayn't you be grabbling?
mayn't they be grabbling? 	mayn't I have grabbled?
mayn't you have grabbled?
mayn't he have grabbled?
mayn't we have grabbled?
mayn't you have grabbled?
mayn't they have grabbled? 	mayn't I have been grabbling?
mayn't you have been grabbling?
mayn't he have been grabbling?
mayn't we have been grabbling?
mayn't you have been grabbling?
mayn't they have been grabbling?