must cluck
Regular verb: cluck - clucked- clucked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must cluck
you must cluck
he must cluck
we must cluck
you must cluck
they must cluck 	I must be clucking
you must be clucking
he must be clucking
we must be clucking
you must be clucking
they must be clucking	I must have clucked
you must have clucked
he must have clucked
we must have clucked
you must have clucked
they must have clucked	I must have been clucking
you must have been clucking
he must have been clucking
we must have been clucking
you must have been clucking
they must have been clucking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not cluck
you must not cluck
he must not cluck
we must not cluck
you must not cluck
they must not cluck 	I must not be clucking
you must not be clucking
he must not be clucking
we must not be clucking
you must not be clucking
they must not be clucking	I must not have clucked
you must not have clucked
he must not have clucked
we must not have clucked
you must not have clucked
they must not have clucked	I must not have been clucking
you must not have been clucking
he must not have been clucking
we must not have been clucking
you must not have been clucking
they must not have been clucking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I cluck?
must you cluck?
must he cluck?
must we cluck?
must you cluck?
must they cluck? 	must I be clucking?
must you be clucking?
must he be clucking?
must we be clucking?
must you be clucking?
must they be clucking? 	must I have clucked?
must you have clucked?
must he have clucked?
must we have clucked?
must you have clucked?
must they have clucked? 	must I have been clucking?
must you have been clucking?
must he have been clucking?
must we have been clucking?
must you have been clucking?
must they have been clucking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not cluck?
must you not cluck?
must he not cluck?
must we not cluck?
must you not cluck?
must they not cluck? 	must I not be clucking?
must you not be clucking?
must he not be clucking?
must we not be clucking?
must you not be clucking?
must they not be clucking? 	must I not have clucked?
must you not have clucked?
must he not have clucked?
must we not have clucked?
must you not have clucked?
must they not have clucked? 	must I not have been clucking?
must you not have been clucking?
must he not have been clucking?
must we not have been clucking?
must you not have been clucking?
must they not have been clucking?