Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could piggy you could piggy she could piggy we could piggy you could piggy they could piggy
V-ing form
I could be piggying you could be piggying she could be piggying we could be piggying you could be piggying they could be piggying
Perfect
I could have piggied you could have piggied she could have piggied we could have piggied you could have piggied they could have piggied
V-ing perfect
I could have been piggying you could have been piggying she could have been piggying we could have been piggying you could have been piggying they could have been piggying
Negation
Simple form
I could not piggy you could not piggy she could not piggy we could not piggy you could not piggy they could not piggy
V-ing form
I could not be piggying you could not be piggying she could not be piggying we could not be piggying you could not be piggying they could not be piggying
Perfect
I could not have piggied you could not have piggied she could not have piggied we could not have piggied you could not have piggied they could not have piggied
V-ing perfect
I could not have been piggying you could not have been piggying she could not have been piggying we could not have been piggying you could not have been piggying they could not have been piggying
Interrogative form
Simple form
could I piggy? could you piggy? could she piggy? could we piggy? could you piggy? could they piggy?
V-ing form
could I be piggying? could you be piggying? could she be piggying? could we be piggying? could you be piggying? could they be piggying?
Perfect
could I have piggied? could you have piggied? could she have piggied? could we have piggied? could you have piggied? could they have piggied?
V-ing perfect
could I have been piggying? could you have been piggying? could she have been piggying? could we have been piggying? could you have been piggying? could they have been piggying?
Interro-negative form
Simple form
could I not piggy? could you not piggy? could she not piggy? could we not piggy? could you not piggy? could they not piggy?
V-ing form
could I not be piggying? could you not be piggying? could she not be piggying? could we not be piggying? could you not be piggying? could they not be piggying?
Perfect
could I not have piggied? could you not have piggied? could she not have piggied? could we not have piggied? could you not have piggied? could they not have piggied?
V-ing perfect
could I not have been piggying? could you not have been piggying? could she not have been piggying? could we not have been piggying? could you not have been piggying? could they not have been piggying?