must flash
Regular verb: flash - flashed- flashed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must flash
you must flash
he must flash
we must flash
you must flash
they must flash 	I must be flashing
you must be flashing
he must be flashing
we must be flashing
you must be flashing
they must be flashing	I must have flashed
you must have flashed
he must have flashed
we must have flashed
you must have flashed
they must have flashed	I must have been flashing
you must have been flashing
he must have been flashing
we must have been flashing
you must have been flashing
they must have been flashing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't flash
you mustn't flash
he mustn't flash
we mustn't flash
you mustn't flash
they mustn't flash 	I mustn't be flashing
you mustn't be flashing
he mustn't be flashing
we mustn't be flashing
you mustn't be flashing
they mustn't be flashing	I mustn't have flashed
you mustn't have flashed
he mustn't have flashed
we mustn't have flashed
you mustn't have flashed
they mustn't have flashed	I mustn't have been flashing
you mustn't have been flashing
he mustn't have been flashing
we mustn't have been flashing
you mustn't have been flashing
they mustn't have been flashing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I flash?
must you flash?
must he flash?
must we flash?
must you flash?
must they flash? 	must I be flashing?
must you be flashing?
must he be flashing?
must we be flashing?
must you be flashing?
must they be flashing? 	must I have flashed?
must you have flashed?
must he have flashed?
must we have flashed?
must you have flashed?
must they have flashed? 	must I have been flashing?
must you have been flashing?
must he have been flashing?
must we have been flashing?
must you have been flashing?
must they have been flashing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I flash?
mustn't you flash?
mustn't he flash?
mustn't we flash?
mustn't you flash?
mustn't they flash? 	mustn't I be flashing?
mustn't you be flashing?
mustn't he be flashing?
mustn't we be flashing?
mustn't you be flashing?
mustn't they be flashing? 	mustn't I have flashed?
mustn't you have flashed?
mustn't he have flashed?
mustn't we have flashed?
mustn't you have flashed?
mustn't they have flashed? 	mustn't I have been flashing?
mustn't you have been flashing?
mustn't he have been flashing?
mustn't we have been flashing?
mustn't you have been flashing?
mustn't they have been flashing?