could four-flush
Regular verb: four-flush - four-flushed- four-flushed

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

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

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

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