could grumble
Verbo regular: grumble - grumbled- grumbled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could grumble
you could grumble
he could grumble
we could grumble
you could grumble
they could grumble 	I could be grumbling
you could be grumbling
he could be grumbling
we could be grumbling
you could be grumbling
they could be grumbling	I could have grumbled
you could have grumbled
he could have grumbled
we could have grumbled
you could have grumbled
they could have grumbled	I could have been grumbling
you could have been grumbling
he could have been grumbling
we could have been grumbling
you could have been grumbling
they could have been grumbling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not grumble
you could not grumble
he could not grumble
we could not grumble
you could not grumble
they could not grumble 	I could not be grumbling
you could not be grumbling
he could not be grumbling
we could not be grumbling
you could not be grumbling
they could not be grumbling	I could not have grumbled
you could not have grumbled
he could not have grumbled
we could not have grumbled
you could not have grumbled
they could not have grumbled	I could not have been grumbling
you could not have been grumbling
he could not have been grumbling
we could not have been grumbling
you could not have been grumbling
they could not have been grumbling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I grumble?
could you grumble?
could he grumble?
could we grumble?
could you grumble?
could they grumble? 	could I be grumbling?
could you be grumbling?
could he be grumbling?
could we be grumbling?
could you be grumbling?
could they be grumbling? 	could I have grumbled?
could you have grumbled?
could he have grumbled?
could we have grumbled?
could you have grumbled?
could they have grumbled? 	could I have been grumbling?
could you have been grumbling?
could he have been grumbling?
could we have been grumbling?
could you have been grumbling?
could they have been grumbling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not grumble?
could you not grumble?
could he not grumble?
could we not grumble?
could you not grumble?
could they not grumble? 	could I not be grumbling?
could you not be grumbling?
could he not be grumbling?
could we not be grumbling?
could you not be grumbling?
could they not be grumbling? 	could I not have grumbled?
could you not have grumbled?
could he not have grumbled?
could we not have grumbled?
could you not have grumbled?
could they not have grumbled? 	could I not have been grumbling?
could you not have been grumbling?
could he not have been grumbling?
could we not have been grumbling?
could you not have been grumbling?
could they not have been grumbling?