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