could tin
Regular verb: tin - tinned- tinned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tin
you couldn't tin
she 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
she 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
she 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
she couldn't have been tinning
we couldn't have been tinning
you couldn't have been tinning
they couldn't have been tinning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tin?
couldn't you tin?
couldn't she 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 she 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 she 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 she have been tinning?
couldn't we have been tinning?
couldn't you have been tinning?
couldn't they have been tinning?