could flow
Regular verb: flow - flowed- flowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could flow
you could flow
she could flow
we could flow
you could flow
they could flow 	I could be flowing
you could be flowing
she could be flowing
we could be flowing
you could be flowing
they could be flowing	I could have flowed
you could have flowed
she could have flowed
we could have flowed
you could have flowed
they could have flowed	I could have been flowing
you could have been flowing
she could have been flowing
we could have been flowing
you could have been flowing
they could have been flowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't flow
you couldn't flow
she couldn't flow
we couldn't flow
you couldn't flow
they couldn't flow 	I couldn't be flowing
you couldn't be flowing
she couldn't be flowing
we couldn't be flowing
you couldn't be flowing
they couldn't be flowing	I couldn't have flowed
you couldn't have flowed
she couldn't have flowed
we couldn't have flowed
you couldn't have flowed
they couldn't have flowed	I couldn't have been flowing
you couldn't have been flowing
she couldn't have been flowing
we couldn't have been flowing
you couldn't have been flowing
they couldn't have been flowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I flow?
could you flow?
could she flow?
could we flow?
could you flow?
could they flow? 	could I be flowing?
could you be flowing?
could she be flowing?
could we be flowing?
could you be flowing?
could they be flowing? 	could I have flowed?
could you have flowed?
could she have flowed?
could we have flowed?
could you have flowed?
could they have flowed? 	could I have been flowing?
could you have been flowing?
could she have been flowing?
could we have been flowing?
could you have been flowing?
could they have been flowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I flow?
couldn't you flow?
couldn't she flow?
couldn't we flow?
couldn't you flow?
couldn't they flow? 	couldn't I be flowing?
couldn't you be flowing?
couldn't she be flowing?
couldn't we be flowing?
couldn't you be flowing?
couldn't they be flowing? 	couldn't I have flowed?
couldn't you have flowed?
couldn't she have flowed?
couldn't we have flowed?
couldn't you have flowed?
couldn't they have flowed? 	couldn't I have been flowing?
couldn't you have been flowing?
couldn't she have been flowing?
couldn't we have been flowing?
couldn't you have been flowing?
couldn't they have been flowing?