could mass
Verbo regular: mass - massed- massed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could mass
you could mass
she could mass
we could mass
you could mass
they could mass 	I could be massing
you could be massing
she could be massing
we could be massing
you could be massing
they could be massing	I could have massed
you could have massed
she could have massed
we could have massed
you could have massed
they could have massed	I could have been massing
you could have been massing
she could have been massing
we could have been massing
you could have been massing
they could have been massing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not mass
you could not mass
she could not mass
we could not mass
you could not mass
they could not mass 	I could not be massing
you could not be massing
she could not be massing
we could not be massing
you could not be massing
they could not be massing	I could not have massed
you could not have massed
she could not have massed
we could not have massed
you could not have massed
they could not have massed	I could not have been massing
you could not have been massing
she could not have been massing
we could not have been massing
you could not have been massing
they could not have been massing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I mass?
could you mass?
could she mass?
could we mass?
could you mass?
could they mass? 	could I be massing?
could you be massing?
could she be massing?
could we be massing?
could you be massing?
could they be massing? 	could I have massed?
could you have massed?
could she have massed?
could we have massed?
could you have massed?
could they have massed? 	could I have been massing?
could you have been massing?
could she have been massing?
could we have been massing?
could you have been massing?
could they have been massing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not mass?
could you not mass?
could she not mass?
could we not mass?
could you not mass?
could they not mass? 	could I not be massing?
could you not be massing?
could she not be massing?
could we not be massing?
could you not be massing?
could they not be massing? 	could I not have massed?
could you not have massed?
could she not have massed?
could we not have massed?
could you not have massed?
could they not have massed? 	could I not have been massing?
could you not have been massing?
could she not have been massing?
could we not have been massing?
could you not have been massing?
could they not have been massing?