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