must four-flush
Regular verb: four-flush - four-flushed- four-flushed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must four-flush
you must four-flush
he must four-flush
we must four-flush
you must four-flush
they must four-flush 	I must be four-flushing
you must be four-flushing
he must be four-flushing
we must be four-flushing
you must be four-flushing
they must be four-flushing	I must have four-flushed
you must have four-flushed
he must have four-flushed
we must have four-flushed
you must have four-flushed
they must have four-flushed	I must have been four-flushing
you must have been four-flushing
he must have been four-flushing
we must have been four-flushing
you must have been four-flushing
they must have been four-flushing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't four-flush
you mustn't four-flush
he mustn't four-flush
we mustn't four-flush
you mustn't four-flush
they mustn't four-flush 	I mustn't be four-flushing
you mustn't be four-flushing
he mustn't be four-flushing
we mustn't be four-flushing
you mustn't be four-flushing
they mustn't be four-flushing	I mustn't have four-flushed
you mustn't have four-flushed
he mustn't have four-flushed
we mustn't have four-flushed
you mustn't have four-flushed
they mustn't have four-flushed	I mustn't have been four-flushing
you mustn't have been four-flushing
he mustn't have been four-flushing
we mustn't have been four-flushing
you mustn't have been four-flushing
they mustn't have been four-flushing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I four-flush?
must you four-flush?
must he four-flush?
must we four-flush?
must you four-flush?
must they four-flush? 	must I be four-flushing?
must you be four-flushing?
must he be four-flushing?
must we be four-flushing?
must you be four-flushing?
must they be four-flushing? 	must I have four-flushed?
must you have four-flushed?
must he have four-flushed?
must we have four-flushed?
must you have four-flushed?
must they have four-flushed? 	must I have been four-flushing?
must you have been four-flushing?
must he have been four-flushing?
must we have been four-flushing?
must you have been four-flushing?
must they have been four-flushing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I four-flush?
mustn't you four-flush?
mustn't he four-flush?
mustn't we four-flush?
mustn't you four-flush?
mustn't they four-flush? 	mustn't I be four-flushing?
mustn't you be four-flushing?
mustn't he be four-flushing?
mustn't we be four-flushing?
mustn't you be four-flushing?
mustn't they be four-flushing? 	mustn't I have four-flushed?
mustn't you have four-flushed?
mustn't he have four-flushed?
mustn't we have four-flushed?
mustn't you have four-flushed?
mustn't they have four-flushed? 	mustn't I have been four-flushing?
mustn't you have been four-flushing?
mustn't he have been four-flushing?
mustn't we have been four-flushing?
mustn't you have been four-flushing?
mustn't they have been four-flushing?