I could party you could party she could party we could party you could party they could party
V-ing form
I could be partying you could be partying she could be partying we could be partying you could be partying they could be partying
Perfect
I could have partied you could have partied she could have partied we could have partied you could have partied they could have partied
V-ing perfect
I could have been partying you could have been partying she could have been partying we could have been partying you could have been partying they could have been partying
Negation
Simple form
I could not party you could not party she could not party we could not party you could not party they could not party
V-ing form
I could not be partying you could not be partying she could not be partying we could not be partying you could not be partying they could not be partying
Perfect
I could not have partied you could not have partied she could not have partied we could not have partied you could not have partied they could not have partied
V-ing perfect
I could not have been partying you could not have been partying she could not have been partying we could not have been partying you could not have been partying they could not have been partying
Interrogative form
Simple form
could I party? could you party? could she party? could we party? could you party? could they party?
V-ing form
could I be partying? could you be partying? could she be partying? could we be partying? could you be partying? could they be partying?
Perfect
could I have partied? could you have partied? could she have partied? could we have partied? could you have partied? could they have partied?
V-ing perfect
could I have been partying? could you have been partying? could she have been partying? could we have been partying? could you have been partying? could they have been partying?
Interro-negative form
Simple form
could I not party? could you not party? could she not party? could we not party? could you not party? could they not party?
V-ing form
could I not be partying? could you not be partying? could she not be partying? could we not be partying? could you not be partying? could they not be partying?
Perfect
could I not have partied? could you not have partied? could she not have partied? could we not have partied? could you not have partied? could they not have partied?
V-ing perfect
could I not have been partying? could you not have been partying? could she not have been partying? could we not have been partying? could you not have been partying? could they not have been partying?