must vapor
Regular verb: vapor - vapored- vapored

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must vapor
you must vapor
he must vapor
we must vapor
you must vapor
they must vapor 	I must be vaporing
you must be vaporing
he must be vaporing
we must be vaporing
you must be vaporing
they must be vaporing	I must have vapored
you must have vapored
he must have vapored
we must have vapored
you must have vapored
they must have vapored	I must have been vaporing
you must have been vaporing
he must have been vaporing
we must have been vaporing
you must have been vaporing
they must have been vaporing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not vapor
you must not vapor
he must not vapor
we must not vapor
you must not vapor
they must not vapor 	I must not be vaporing
you must not be vaporing
he must not be vaporing
we must not be vaporing
you must not be vaporing
they must not be vaporing	I must not have vapored
you must not have vapored
he must not have vapored
we must not have vapored
you must not have vapored
they must not have vapored	I must not have been vaporing
you must not have been vaporing
he must not have been vaporing
we must not have been vaporing
you must not have been vaporing
they must not have been vaporing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I vapor?
must you vapor?
must he vapor?
must we vapor?
must you vapor?
must they vapor? 	must I be vaporing?
must you be vaporing?
must he be vaporing?
must we be vaporing?
must you be vaporing?
must they be vaporing? 	must I have vapored?
must you have vapored?
must he have vapored?
must we have vapored?
must you have vapored?
must they have vapored? 	must I have been vaporing?
must you have been vaporing?
must he have been vaporing?
must we have been vaporing?
must you have been vaporing?
must they have been vaporing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not vapor?
must you not vapor?
must he not vapor?
must we not vapor?
must you not vapor?
must they not vapor? 	must I not be vaporing?
must you not be vaporing?
must he not be vaporing?
must we not be vaporing?
must you not be vaporing?
must they not be vaporing? 	must I not have vapored?
must you not have vapored?
must he not have vapored?
must we not have vapored?
must you not have vapored?
must they not have vapored? 	must I not have been vaporing?
must you not have been vaporing?
must he not have been vaporing?
must we not have been vaporing?
must you not have been vaporing?
must they not have been vaporing?