English verb conjugation
COULD TIN

Regular verb: tin - tinned - tinned

Affirmation

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