could tin
Verbo regular: tin - tinned- tinned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could tin
you could tin
he could tin
we could tin
you could tin
they could tin 	I could be tinning
you could be tinning
he could be tinning
we could be tinning
you could be tinning
they could be tinning	I could have tinned
you could have tinned
he 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
he could have been tinning
we could have been tinning
you could have been tinning
they could have been tinning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't tin
you couldn't tin
he couldn't tin
we couldn't tin
you couldn't tin
they couldn't tin 	I couldn't be tinning
you couldn't be tinning
he couldn't be tinning
we couldn't be tinning
you couldn't be tinning
they couldn't be tinning	I couldn't have tinned
you couldn't have tinned
he couldn't have tinned
we couldn't have tinned
you couldn't have tinned
they couldn't have tinned	I couldn't have been tinning
you couldn't have been tinning
he couldn't have been tinning
we couldn't have been tinning
you couldn't have been tinning
they couldn't have been tinning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I tin?
could you tin?
could he tin?
could we tin?
could you tin?
could they tin? 	could I be tinning?
could you be tinning?
could he be tinning?
could we be tinning?
could you be tinning?
could they be tinning? 	could I have tinned?
could you have tinned?
could he 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 he have been tinning?
could we have been tinning?
could you have been tinning?
could they have been tinning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I tin?
couldn't you tin?
couldn't he tin?
couldn't we tin?
couldn't you tin?
couldn't they tin? 	couldn't I be tinning?
couldn't you be tinning?
couldn't he be tinning?
couldn't we be tinning?
couldn't you be tinning?
couldn't they be tinning? 	couldn't I have tinned?
couldn't you have tinned?
couldn't he have tinned?
couldn't we have tinned?
couldn't you have tinned?
couldn't they have tinned? 	couldn't I have been tinning?
couldn't you have been tinning?
couldn't he have been tinning?
couldn't we have been tinning?
couldn't you have been tinning?
couldn't they have been tinning?