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