could protest
Verbo regular: protest - protested- protested

Afirmación 	
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I could protest
you could protest
he could protest
we could protest
you could protest
they could protest 	I could be protesting
you could be protesting
he could be protesting
we could be protesting
you could be protesting
they could be protesting	I could have protested
you could have protested
he could have protested
we could have protested
you could have protested
they could have protested	I could have been protesting
you could have been protesting
he could have been protesting
we could have been protesting
you could have been protesting
they could have been protesting	

Negación 	
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I couldn't protest
you couldn't protest
he couldn't protest
we couldn't protest
you couldn't protest
they couldn't protest 	I couldn't be protesting
you couldn't be protesting
he couldn't be protesting
we couldn't be protesting
you couldn't be protesting
they couldn't be protesting	I couldn't have protested
you couldn't have protested
he couldn't have protested
we couldn't have protested
you couldn't have protested
they couldn't have protested	I couldn't have been protesting
you couldn't have been protesting
he couldn't have been protesting
we couldn't have been protesting
you couldn't have been protesting
they couldn't have been protesting	

Forma interrogativa 	
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could I protest?
could you protest?
could he protest?
could we protest?
could you protest?
could they protest? 	could I be protesting?
could you be protesting?
could he be protesting?
could we be protesting?
could you be protesting?
could they be protesting? 	could I have protested?
could you have protested?
could he have protested?
could we have protested?
could you have protested?
could they have protested? 	could I have been protesting?
could you have been protesting?
could he have been protesting?
could we have been protesting?
could you have been protesting?
could they have been protesting? 	

Forma interro-negativa 	
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couldn't I protest?
couldn't you protest?
couldn't he protest?
couldn't we protest?
couldn't you protest?
couldn't they protest? 	couldn't I be protesting?
couldn't you be protesting?
couldn't he be protesting?
couldn't we be protesting?
couldn't you be protesting?
couldn't they be protesting? 	couldn't I have protested?
couldn't you have protested?
couldn't he have protested?
couldn't we have protested?
couldn't you have protested?
couldn't they have protested? 	couldn't I have been protesting?
couldn't you have been protesting?
couldn't he have been protesting?
couldn't we have been protesting?
couldn't you have been protesting?
couldn't they have been protesting?