must zap
Regular verb: zap - zapped- zapped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must zap
you must zap
he must zap
we must zap
you must zap
they must zap 	I must be zapping
you must be zapping
he must be zapping
we must be zapping
you must be zapping
they must be zapping	I must have zapped
you must have zapped
he must have zapped
we must have zapped
you must have zapped
they must have zapped	I must have been zapping
you must have been zapping
he must have been zapping
we must have been zapping
you must have been zapping
they must have been zapping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not zap
you must not zap
he must not zap
we must not zap
you must not zap
they must not zap 	I must not be zapping
you must not be zapping
he must not be zapping
we must not be zapping
you must not be zapping
they must not be zapping	I must not have zapped
you must not have zapped
he must not have zapped
we must not have zapped
you must not have zapped
they must not have zapped	I must not have been zapping
you must not have been zapping
he must not have been zapping
we must not have been zapping
you must not have been zapping
they must not have been zapping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I zap?
must you zap?
must he zap?
must we zap?
must you zap?
must they zap? 	must I be zapping?
must you be zapping?
must he be zapping?
must we be zapping?
must you be zapping?
must they be zapping? 	must I have zapped?
must you have zapped?
must he have zapped?
must we have zapped?
must you have zapped?
must they have zapped? 	must I have been zapping?
must you have been zapping?
must he have been zapping?
must we have been zapping?
must you have been zapping?
must they have been zapping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not zap?
must you not zap?
must he not zap?
must we not zap?
must you not zap?
must they not zap? 	must I not be zapping?
must you not be zapping?
must he not be zapping?
must we not be zapping?
must you not be zapping?
must they not be zapping? 	must I not have zapped?
must you not have zapped?
must he not have zapped?
must we not have zapped?
must you not have zapped?
must they not have zapped? 	must I not have been zapping?
must you not have been zapping?
must he not have been zapping?
must we not have been zapping?
must you not have been zapping?
must they not have been zapping?