English verb conjugation
COULD TIN

Regular verb: tin - tinned - tinned

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
I could not tin you could not tin he 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 he could not be tinning we could not be tinning you could not be tinning they could not be tinning
Perfect	V-ing perfect
I could not have tinned you could not have tinned he 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 he could not have been tinning we could not have been tinning you could not have been tinning they could not have been tinning

Interrogative form

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

Interro-negative form

Simple form	V-ing form
could I not tin? could you not tin? could he 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 he not be tinning? could we not be tinning? could you not be tinning? could they not be tinning?
Perfect	V-ing perfect
could I not have tinned? could you not have tinned? could he 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 he not have been tinning? could we not have been tinning? could you not have been tinning? could they not have been tinning?