could quicken
Verbo regular: quicken - quickened- quickened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could quicken
you could quicken
he could quicken
we could quicken
you could quicken
they could quicken 	I could be quickening
you could be quickening
he could be quickening
we could be quickening
you could be quickening
they could be quickening	I could have quickened
you could have quickened
he could have quickened
we could have quickened
you could have quickened
they could have quickened	I could have been quickening
you could have been quickening
he could have been quickening
we could have been quickening
you could have been quickening
they could have been quickening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't quicken
you couldn't quicken
he couldn't quicken
we couldn't quicken
you couldn't quicken
they couldn't quicken 	I couldn't be quickening
you couldn't be quickening
he couldn't be quickening
we couldn't be quickening
you couldn't be quickening
they couldn't be quickening	I couldn't have quickened
you couldn't have quickened
he couldn't have quickened
we couldn't have quickened
you couldn't have quickened
they couldn't have quickened	I couldn't have been quickening
you couldn't have been quickening
he couldn't have been quickening
we couldn't have been quickening
you couldn't have been quickening
they couldn't have been quickening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I quicken?
could you quicken?
could he quicken?
could we quicken?
could you quicken?
could they quicken? 	could I be quickening?
could you be quickening?
could he be quickening?
could we be quickening?
could you be quickening?
could they be quickening? 	could I have quickened?
could you have quickened?
could he have quickened?
could we have quickened?
could you have quickened?
could they have quickened? 	could I have been quickening?
could you have been quickening?
could he have been quickening?
could we have been quickening?
could you have been quickening?
could they have been quickening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I quicken?
couldn't you quicken?
couldn't he quicken?
couldn't we quicken?
couldn't you quicken?
couldn't they quicken? 	couldn't I be quickening?
couldn't you be quickening?
couldn't he be quickening?
couldn't we be quickening?
couldn't you be quickening?
couldn't they be quickening? 	couldn't I have quickened?
couldn't you have quickened?
couldn't he have quickened?
couldn't we have quickened?
couldn't you have quickened?
couldn't they have quickened? 	couldn't I have been quickening?
couldn't you have been quickening?
couldn't he have been quickening?
couldn't we have been quickening?
couldn't you have been quickening?
couldn't they have been quickening?