could protract
Verbo regular: protract - protracted- protracted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could protract
you could protract
he could protract
we could protract
you could protract
they could protract 	I could be protracting
you could be protracting
he could be protracting
we could be protracting
you could be protracting
they could be protracting	I could have protracted
you could have protracted
he could have protracted
we could have protracted
you could have protracted
they could have protracted	I could have been protracting
you could have been protracting
he could have been protracting
we could have been protracting
you could have been protracting
they could have been protracting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't protract
you couldn't protract
he couldn't protract
we couldn't protract
you couldn't protract
they couldn't protract 	I couldn't be protracting
you couldn't be protracting
he couldn't be protracting
we couldn't be protracting
you couldn't be protracting
they couldn't be protracting	I couldn't have protracted
you couldn't have protracted
he couldn't have protracted
we couldn't have protracted
you couldn't have protracted
they couldn't have protracted	I couldn't have been protracting
you couldn't have been protracting
he couldn't have been protracting
we couldn't have been protracting
you couldn't have been protracting
they couldn't have been protracting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I protract?
could you protract?
could he protract?
could we protract?
could you protract?
could they protract? 	could I be protracting?
could you be protracting?
could he be protracting?
could we be protracting?
could you be protracting?
could they be protracting? 	could I have protracted?
could you have protracted?
could he have protracted?
could we have protracted?
could you have protracted?
could they have protracted? 	could I have been protracting?
could you have been protracting?
could he have been protracting?
could we have been protracting?
could you have been protracting?
could they have been protracting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I protract?
couldn't you protract?
couldn't he protract?
couldn't we protract?
couldn't you protract?
couldn't they protract? 	couldn't I be protracting?
couldn't you be protracting?
couldn't he be protracting?
couldn't we be protracting?
couldn't you be protracting?
couldn't they be protracting? 	couldn't I have protracted?
couldn't you have protracted?
couldn't he have protracted?
couldn't we have protracted?
couldn't you have protracted?
couldn't they have protracted? 	couldn't I have been protracting?
couldn't you have been protracting?
couldn't he have been protracting?
couldn't we have been protracting?
couldn't you have been protracting?
couldn't they have been protracting?