could frog
Regular verb: frog - froged- froged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could frog
you could frog
she could frog
we could frog
you could frog
they could frog 	I could be froging
you could be froging
she could be froging
we could be froging
you could be froging
they could be froging	I could have froged
you could have froged
she could have froged
we could have froged
you could have froged
they could have froged	I could have been froging
you could have been froging
she could have been froging
we could have been froging
you could have been froging
they could have been froging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't frog
you couldn't frog
she couldn't frog
we couldn't frog
you couldn't frog
they couldn't frog 	I couldn't be froging
you couldn't be froging
she couldn't be froging
we couldn't be froging
you couldn't be froging
they couldn't be froging	I couldn't have froged
you couldn't have froged
she couldn't have froged
we couldn't have froged
you couldn't have froged
they couldn't have froged	I couldn't have been froging
you couldn't have been froging
she couldn't have been froging
we couldn't have been froging
you couldn't have been froging
they couldn't have been froging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I frog?
could you frog?
could she frog?
could we frog?
could you frog?
could they frog? 	could I be froging?
could you be froging?
could she be froging?
could we be froging?
could you be froging?
could they be froging? 	could I have froged?
could you have froged?
could she have froged?
could we have froged?
could you have froged?
could they have froged? 	could I have been froging?
could you have been froging?
could she have been froging?
could we have been froging?
could you have been froging?
could they have been froging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I frog?
couldn't you frog?
couldn't she frog?
couldn't we frog?
couldn't you frog?
couldn't they frog? 	couldn't I be froging?
couldn't you be froging?
couldn't she be froging?
couldn't we be froging?
couldn't you be froging?
couldn't they be froging? 	couldn't I have froged?
couldn't you have froged?
couldn't she have froged?
couldn't we have froged?
couldn't you have froged?
couldn't they have froged? 	couldn't I have been froging?
couldn't you have been froging?
couldn't she have been froging?
couldn't we have been froging?
couldn't you have been froging?
couldn't they have been froging?