could tin
Verbo regular: tin - tinned- tinned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could tin
you could tin
she could tin
we could tin
you could tin
they could tin 	I could be tinning
you could be tinning
she could be tinning
we could be tinning
you could be tinning
they could be tinning	I could have tinned
you could have tinned
she could have tinned
we could have tinned
you could have tinned
they could have tinned	I could have been tinning
you could have been tinning
she could have been tinning
we could have been tinning
you could have been tinning
they could have been tinning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not tin
you could not tin
she could not tin
we could not tin
you could not tin
they could not tin 	I could not be tinning
you could not be tinning
she could not be tinning
we could not be tinning
you could not be tinning
they could not be tinning	I could not have tinned
you could not have tinned
she could not have tinned
we could not have tinned
you could not have tinned
they could not have tinned	I could not have been tinning
you could not have been tinning
she could not have been tinning
we could not have been tinning
you could not have been tinning
they could not have been tinning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I tin?
could you tin?
could she tin?
could we tin?
could you tin?
could they tin? 	could I be tinning?
could you be tinning?
could she be tinning?
could we be tinning?
could you be tinning?
could they be tinning? 	could I have tinned?
could you have tinned?
could she have tinned?
could we have tinned?
could you have tinned?
could they have tinned? 	could I have been tinning?
could you have been tinning?
could she have been tinning?
could we have been tinning?
could you have been tinning?
could they have been tinning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not tin?
could you not tin?
could she not tin?
could we not tin?
could you not tin?
could they not tin? 	could I not be tinning?
could you not be tinning?
could she not be tinning?
could we not be tinning?
could you not be tinning?
could they not be tinning? 	could I not have tinned?
could you not have tinned?
could she not have tinned?
could we not have tinned?
could you not have tinned?
could they not have tinned? 	could I not have been tinning?
could you not have been tinning?
could she not have been tinning?
could we not have been tinning?
could you not have been tinning?
could they not have been tinning?