I could slim you could slim she could slim we could slim you could slim they could slim
V-ing form
I could be slimming you could be slimming she could be slimming we could be slimming you could be slimming they could be slimming
Perfect
I could have slimmed you could have slimmed she could have slimmed we could have slimmed you could have slimmed they could have slimmed
V-ing perfect
I could have been slimming you could have been slimming she could have been slimming we could have been slimming you could have been slimming they could have been slimming
Negation
Simple form
I could not slim you could not slim she could not slim we could not slim you could not slim they could not slim
V-ing form
I could not be slimming you could not be slimming she could not be slimming we could not be slimming you could not be slimming they could not be slimming
Perfect
I could not have slimmed you could not have slimmed she could not have slimmed we could not have slimmed you could not have slimmed they could not have slimmed
V-ing perfect
I could not have been slimming you could not have been slimming she could not have been slimming we could not have been slimming you could not have been slimming they could not have been slimming
Interrogative form
Simple form
could I slim? could you slim? could she slim? could we slim? could you slim? could they slim?
V-ing form
could I be slimming? could you be slimming? could she be slimming? could we be slimming? could you be slimming? could they be slimming?
Perfect
could I have slimmed? could you have slimmed? could she have slimmed? could we have slimmed? could you have slimmed? could they have slimmed?
V-ing perfect
could I have been slimming? could you have been slimming? could she have been slimming? could we have been slimming? could you have been slimming? could they have been slimming?
Interro-negative form
Simple form
could I not slim? could you not slim? could she not slim? could we not slim? could you not slim? could they not slim?
V-ing form
could I not be slimming? could you not be slimming? could she not be slimming? could we not be slimming? could you not be slimming? could they not be slimming?
Perfect
could I not have slimmed? could you not have slimmed? could she not have slimmed? could we not have slimmed? could you not have slimmed? could they not have slimmed?
V-ing perfect
could I not have been slimming? could you not have been slimming? could she not have been slimming? could we not have been slimming? could you not have been slimming? could they not have been slimming?