must decerebrate
Regular verb: decerebrate - decerebrated- decerebrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must decerebrate
you must decerebrate
he must decerebrate
we must decerebrate
you must decerebrate
they must decerebrate 	I must be decerebrating
you must be decerebrating
he must be decerebrating
we must be decerebrating
you must be decerebrating
they must be decerebrating	I must have decerebrated
you must have decerebrated
he must have decerebrated
we must have decerebrated
you must have decerebrated
they must have decerebrated	I must have been decerebrating
you must have been decerebrating
he must have been decerebrating
we must have been decerebrating
you must have been decerebrating
they must have been decerebrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not decerebrate
you must not decerebrate
he must not decerebrate
we must not decerebrate
you must not decerebrate
they must not decerebrate 	I must not be decerebrating
you must not be decerebrating
he must not be decerebrating
we must not be decerebrating
you must not be decerebrating
they must not be decerebrating	I must not have decerebrated
you must not have decerebrated
he must not have decerebrated
we must not have decerebrated
you must not have decerebrated
they must not have decerebrated	I must not have been decerebrating
you must not have been decerebrating
he must not have been decerebrating
we must not have been decerebrating
you must not have been decerebrating
they must not have been decerebrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I decerebrate?
must you decerebrate?
must he decerebrate?
must we decerebrate?
must you decerebrate?
must they decerebrate? 	must I be decerebrating?
must you be decerebrating?
must he be decerebrating?
must we be decerebrating?
must you be decerebrating?
must they be decerebrating? 	must I have decerebrated?
must you have decerebrated?
must he have decerebrated?
must we have decerebrated?
must you have decerebrated?
must they have decerebrated? 	must I have been decerebrating?
must you have been decerebrating?
must he have been decerebrating?
must we have been decerebrating?
must you have been decerebrating?
must they have been decerebrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not decerebrate?
must you not decerebrate?
must he not decerebrate?
must we not decerebrate?
must you not decerebrate?
must they not decerebrate? 	must I not be decerebrating?
must you not be decerebrating?
must he not be decerebrating?
must we not be decerebrating?
must you not be decerebrating?
must they not be decerebrating? 	must I not have decerebrated?
must you not have decerebrated?
must he not have decerebrated?
must we not have decerebrated?
must you not have decerebrated?
must they not have decerebrated? 	must I not have been decerebrating?
must you not have been decerebrating?
must he not have been decerebrating?
must we not have been decerebrating?
must you not have been decerebrating?
must they not have been decerebrating?