could frog
Verbo regular: frog - froged- froged

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could frog
you could frog
he could frog
we could frog
you could frog
they could frog 	I could be froging
you could be froging
he could be froging
we could be froging
you could be froging
they could be froging	I could have froged
you could have froged
he 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
he could have been froging
we could have been froging
you could have been froging
they could have been froging	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't frog
you couldn't frog
he 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
he 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
he 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
he couldn't have been froging
we couldn't have been froging
you couldn't have been froging
they couldn't have been froging	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I frog?
could you frog?
could he frog?
could we frog?
could you frog?
could they frog? 	could I be froging?
could you be froging?
could he be froging?
could we be froging?
could you be froging?
could they be froging? 	could I have froged?
could you have froged?
could he 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 he have been froging?
could we have been froging?
could you have been froging?
could they have been froging? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I frog?
couldn't you frog?
couldn't he 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 he 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 he 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 he have been froging?
couldn't we have been froging?
couldn't you have been froging?
couldn't they have been froging?