could protest
Verbo regular: protest - protested- protested

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not protest
you could not protest
he could not protest
we could not protest
you could not protest
they could not protest 	I could not be protesting
you could not be protesting
he could not be protesting
we could not be protesting
you could not be protesting
they could not be protesting	I could not have protested
you could not have protested
he could not have protested
we could not have protested
you could not have protested
they could not have protested	I could not have been protesting
you could not have been protesting
he could not have been protesting
we could not have been protesting
you could not have been protesting
they could not have been protesting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not protest?
could you not protest?
could he not protest?
could we not protest?
could you not protest?
could they not protest? 	could I not be protesting?
could you not be protesting?
could he not be protesting?
could we not be protesting?
could you not be protesting?
could they not be protesting? 	could I not have protested?
could you not have protested?
could he not have protested?
could we not have protested?
could you not have protested?
could they not have protested? 	could I not have been protesting?
could you not have been protesting?
could he not have been protesting?
could we not have been protesting?
could you not have been protesting?
could they not have been protesting?