could birl
Verbo regular: birl - birled- birled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could birl
you could birl
he could birl
we could birl
you could birl
they could birl 	I could be birling
you could be birling
he could be birling
we could be birling
you could be birling
they could be birling	I could have birled
you could have birled
he could have birled
we could have birled
you could have birled
they could have birled	I could have been birling
you could have been birling
he could have been birling
we could have been birling
you could have been birling
they could have been birling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't birl
you couldn't birl
he couldn't birl
we couldn't birl
you couldn't birl
they couldn't birl 	I couldn't be birling
you couldn't be birling
he couldn't be birling
we couldn't be birling
you couldn't be birling
they couldn't be birling	I couldn't have birled
you couldn't have birled
he couldn't have birled
we couldn't have birled
you couldn't have birled
they couldn't have birled	I couldn't have been birling
you couldn't have been birling
he couldn't have been birling
we couldn't have been birling
you couldn't have been birling
they couldn't have been birling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I birl?
could you birl?
could he birl?
could we birl?
could you birl?
could they birl? 	could I be birling?
could you be birling?
could he be birling?
could we be birling?
could you be birling?
could they be birling? 	could I have birled?
could you have birled?
could he have birled?
could we have birled?
could you have birled?
could they have birled? 	could I have been birling?
could you have been birling?
could he have been birling?
could we have been birling?
could you have been birling?
could they have been birling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I birl?
couldn't you birl?
couldn't he birl?
couldn't we birl?
couldn't you birl?
couldn't they birl? 	couldn't I be birling?
couldn't you be birling?
couldn't he be birling?
couldn't we be birling?
couldn't you be birling?
couldn't they be birling? 	couldn't I have birled?
couldn't you have birled?
couldn't he have birled?
couldn't we have birled?
couldn't you have birled?
couldn't they have birled? 	couldn't I have been birling?
couldn't you have been birling?
couldn't he have been birling?
couldn't we have been birling?
couldn't you have been birling?
couldn't they have been birling?