must flash
Regular verb: flash - flashed- flashed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must flash
you must flash
she must flash
we must flash
you must flash
they must flash 	I must be flashing
you must be flashing
she must be flashing
we must be flashing
you must be flashing
they must be flashing	I must have flashed
you must have flashed
she 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
she 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 must not flash
you must not flash
she must not flash
we must not flash
you must not flash
they must not flash 	I must not be flashing
you must not be flashing
she must not be flashing
we must not be flashing
you must not be flashing
they must not be flashing	I must not have flashed
you must not have flashed
she must not have flashed
we must not have flashed
you must not have flashed
they must not have flashed	I must not have been flashing
you must not have been flashing
she must not have been flashing
we must not have been flashing
you must not have been flashing
they must not have been flashing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I flash?
must you flash?
must she flash?
must we flash?
must you flash?
must they flash? 	must I be flashing?
must you be flashing?
must she be flashing?
must we be flashing?
must you be flashing?
must they be flashing? 	must I have flashed?
must you have flashed?
must she 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 she 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 	
must I not flash?
must you not flash?
must she not flash?
must we not flash?
must you not flash?
must they not flash? 	must I not be flashing?
must you not be flashing?
must she not be flashing?
must we not be flashing?
must you not be flashing?
must they not be flashing? 	must I not have flashed?
must you not have flashed?
must she not have flashed?
must we not have flashed?
must you not have flashed?
must they not have flashed? 	must I not have been flashing?
must you not have been flashing?
must she not have been flashing?
must we not have been flashing?
must you not have been flashing?
must they not have been flashing?