could mumble
Verbo regular: mumble - mumbled- mumbled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could mumble
you could mumble
she could mumble
we could mumble
you could mumble
they could mumble 	I could be mumbling
you could be mumbling
she could be mumbling
we could be mumbling
you could be mumbling
they could be mumbling	I could have mumbled
you could have mumbled
she could have mumbled
we could have mumbled
you could have mumbled
they could have mumbled	I could have been mumbling
you could have been mumbling
she could have been mumbling
we could have been mumbling
you could have been mumbling
they could have been mumbling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not mumble
you could not mumble
she could not mumble
we could not mumble
you could not mumble
they could not mumble 	I could not be mumbling
you could not be mumbling
she could not be mumbling
we could not be mumbling
you could not be mumbling
they could not be mumbling	I could not have mumbled
you could not have mumbled
she could not have mumbled
we could not have mumbled
you could not have mumbled
they could not have mumbled	I could not have been mumbling
you could not have been mumbling
she could not have been mumbling
we could not have been mumbling
you could not have been mumbling
they could not have been mumbling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I mumble?
could you mumble?
could she mumble?
could we mumble?
could you mumble?
could they mumble? 	could I be mumbling?
could you be mumbling?
could she be mumbling?
could we be mumbling?
could you be mumbling?
could they be mumbling? 	could I have mumbled?
could you have mumbled?
could she have mumbled?
could we have mumbled?
could you have mumbled?
could they have mumbled? 	could I have been mumbling?
could you have been mumbling?
could she have been mumbling?
could we have been mumbling?
could you have been mumbling?
could they have been mumbling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not mumble?
could you not mumble?
could she not mumble?
could we not mumble?
could you not mumble?
could they not mumble? 	could I not be mumbling?
could you not be mumbling?
could she not be mumbling?
could we not be mumbling?
could you not be mumbling?
could they not be mumbling? 	could I not have mumbled?
could you not have mumbled?
could she not have mumbled?
could we not have mumbled?
could you not have mumbled?
could they not have mumbled? 	could I not have been mumbling?
could you not have been mumbling?
could she not have been mumbling?
could we not have been mumbling?
could you not have been mumbling?
could they not have been mumbling?