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