must countermarch
Regular verb: countermarch - countermarched- countermarched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must countermarch
you must countermarch
he must countermarch
we must countermarch
you must countermarch
they must countermarch 	I must be countermarching
you must be countermarching
he must be countermarching
we must be countermarching
you must be countermarching
they must be countermarching	I must have countermarched
you must have countermarched
he must have countermarched
we must have countermarched
you must have countermarched
they must have countermarched	I must have been countermarching
you must have been countermarching
he must have been countermarching
we must have been countermarching
you must have been countermarching
they must have been countermarching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not countermarch
you must not countermarch
he must not countermarch
we must not countermarch
you must not countermarch
they must not countermarch 	I must not be countermarching
you must not be countermarching
he must not be countermarching
we must not be countermarching
you must not be countermarching
they must not be countermarching	I must not have countermarched
you must not have countermarched
he must not have countermarched
we must not have countermarched
you must not have countermarched
they must not have countermarched	I must not have been countermarching
you must not have been countermarching
he must not have been countermarching
we must not have been countermarching
you must not have been countermarching
they must not have been countermarching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I countermarch?
must you countermarch?
must he countermarch?
must we countermarch?
must you countermarch?
must they countermarch? 	must I be countermarching?
must you be countermarching?
must he be countermarching?
must we be countermarching?
must you be countermarching?
must they be countermarching? 	must I have countermarched?
must you have countermarched?
must he have countermarched?
must we have countermarched?
must you have countermarched?
must they have countermarched? 	must I have been countermarching?
must you have been countermarching?
must he have been countermarching?
must we have been countermarching?
must you have been countermarching?
must they have been countermarching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not countermarch?
must you not countermarch?
must he not countermarch?
must we not countermarch?
must you not countermarch?
must they not countermarch? 	must I not be countermarching?
must you not be countermarching?
must he not be countermarching?
must we not be countermarching?
must you not be countermarching?
must they not be countermarching? 	must I not have countermarched?
must you not have countermarched?
must he not have countermarched?
must we not have countermarched?
must you not have countermarched?
must they not have countermarched? 	must I not have been countermarching?
must you not have been countermarching?
must he not have been countermarching?
must we not have been countermarching?
must you not have been countermarching?
must they not have been countermarching?