must captain
Regular verb: captain - captained- captained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must captain
you must captain
he must captain
we must captain
you must captain
they must captain 	I must be captaining
you must be captaining
he must be captaining
we must be captaining
you must be captaining
they must be captaining	I must have captained
you must have captained
he must have captained
we must have captained
you must have captained
they must have captained	I must have been captaining
you must have been captaining
he must have been captaining
we must have been captaining
you must have been captaining
they must have been captaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not captain
you must not captain
he must not captain
we must not captain
you must not captain
they must not captain 	I must not be captaining
you must not be captaining
he must not be captaining
we must not be captaining
you must not be captaining
they must not be captaining	I must not have captained
you must not have captained
he must not have captained
we must not have captained
you must not have captained
they must not have captained	I must not have been captaining
you must not have been captaining
he must not have been captaining
we must not have been captaining
you must not have been captaining
they must not have been captaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I captain?
must you captain?
must he captain?
must we captain?
must you captain?
must they captain? 	must I be captaining?
must you be captaining?
must he be captaining?
must we be captaining?
must you be captaining?
must they be captaining? 	must I have captained?
must you have captained?
must he have captained?
must we have captained?
must you have captained?
must they have captained? 	must I have been captaining?
must you have been captaining?
must he have been captaining?
must we have been captaining?
must you have been captaining?
must they have been captaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not captain?
must you not captain?
must he not captain?
must we not captain?
must you not captain?
must they not captain? 	must I not be captaining?
must you not be captaining?
must he not be captaining?
must we not be captaining?
must you not be captaining?
must they not be captaining? 	must I not have captained?
must you not have captained?
must he not have captained?
must we not have captained?
must you not have captained?
must they not have captained? 	must I not have been captaining?
must you not have been captaining?
must he not have been captaining?
must we not have been captaining?
must you not have been captaining?
must they not have been captaining?