I could kid you could kid she could kid we could kid you could kid they could kid
V-ing form
I could be kiding you could be kiding she could be kiding we could be kiding you could be kiding they could be kiding
Perfect
I could have kided you could have kided she could have kided we could have kided you could have kided they could have kided
V-ing perfect
I could have been kiding you could have been kiding she could have been kiding we could have been kiding you could have been kiding they could have been kiding
Negation
Simple form
I couldn't kid you couldn't kid she couldn't kid we couldn't kid you couldn't kid they couldn't kid
V-ing form
I couldn't be kiding you couldn't be kiding she couldn't be kiding we couldn't be kiding you couldn't be kiding they couldn't be kiding
Perfect
I couldn't have kided you couldn't have kided she couldn't have kided we couldn't have kided you couldn't have kided they couldn't have kided
V-ing perfect
I couldn't have been kiding you couldn't have been kiding she couldn't have been kiding we couldn't have been kiding you couldn't have been kiding they couldn't have been kiding
Interrogative form
Simple form
could I kid? could you kid? could she kid? could we kid? could you kid? could they kid?
V-ing form
could I be kiding? could you be kiding? could she be kiding? could we be kiding? could you be kiding? could they be kiding?
Perfect
could I have kided? could you have kided? could she have kided? could we have kided? could you have kided? could they have kided?
V-ing perfect
could I have been kiding? could you have been kiding? could she have been kiding? could we have been kiding? could you have been kiding? could they have been kiding?
Interro-negative form
Simple form
couldn't I kid? couldn't you kid? couldn't she kid? couldn't we kid? couldn't you kid? couldn't they kid?
V-ing form
couldn't I be kiding? couldn't you be kiding? couldn't she be kiding? couldn't we be kiding? couldn't you be kiding? couldn't they be kiding?
Perfect
couldn't I have kided? couldn't you have kided? couldn't she have kided? couldn't we have kided? couldn't you have kided? couldn't they have kided?
V-ing perfect
couldn't I have been kiding? couldn't you have been kiding? couldn't she have been kiding? couldn't we have been kiding? couldn't you have been kiding? couldn't they have been kiding?