may clack
Regular verb: clack - clacked- clacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may clack
you may clack
she may clack
we may clack
you may clack
they may clack 	I may be clacking
you may be clacking
she may be clacking
we may be clacking
you may be clacking
they may be clacking	I may have clacked
you may have clacked
she may have clacked
we may have clacked
you may have clacked
they may have clacked	I may have been clacking
you may have been clacking
she may have been clacking
we may have been clacking
you may have been clacking
they may have been clacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not clack
you may not clack
she may not clack
we may not clack
you may not clack
they may not clack 	I may not be clacking
you may not be clacking
she may not be clacking
we may not be clacking
you may not be clacking
they may not be clacking	I may not have clacked
you may not have clacked
she may not have clacked
we may not have clacked
you may not have clacked
they may not have clacked	I may not have been clacking
you may not have been clacking
she may not have been clacking
we may not have been clacking
you may not have been clacking
they may not have been clacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I clack?
may you clack?
may she clack?
may we clack?
may you clack?
may they clack? 	may I be clacking?
may you be clacking?
may she be clacking?
may we be clacking?
may you be clacking?
may they be clacking? 	may I have clacked?
may you have clacked?
may she have clacked?
may we have clacked?
may you have clacked?
may they have clacked? 	may I have been clacking?
may you have been clacking?
may she have been clacking?
may we have been clacking?
may you have been clacking?
may they have been clacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not clack?
may you not clack?
may she not clack?
may we not clack?
may you not clack?
may they not clack? 	may I not be clacking?
may you not be clacking?
may she not be clacking?
may we not be clacking?
may you not be clacking?
may they not be clacking? 	may I not have clacked?
may you not have clacked?
may she not have clacked?
may we not have clacked?
may you not have clacked?
may they not have clacked? 	may I not have been clacking?
may you not have been clacking?
may she not have been clacking?
may we not have been clacking?
may you not have been clacking?
may they not have been clacking?