could flush
Regular verb: flush - flushed- flushed

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

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

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

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