I could fuck you could fuck he could fuck we could fuck you could fuck they could fuck
V-ing form
I could be fucking you could be fucking he could be fucking we could be fucking you could be fucking they could be fucking
Perfect
I could have fucked you could have fucked he 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 he 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 he 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 he 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 he 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 he 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 he fuck? could we fuck? could you fuck? could they fuck?
V-ing form
could I be fucking? could you be fucking? could he be fucking? could we be fucking? could you be fucking? could they be fucking?
Perfect
could I have fucked? could you have fucked? could he 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 he 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 he 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 he 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 he 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 he have been fucking? couldn't we have been fucking? couldn't you have been fucking? couldn't they have been fucking?