I can fuck you can fuck she can fuck we can fuck you can fuck they can fuck
V-ing form
I can be fucking you can be fucking she can be fucking we can be fucking you can be fucking they can be fucking
Perfect
I can have fucked you can have fucked she 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 she can have been fucking we can have been fucking you can have been fucking they can have been fucking
Negation
Simple form
I cannot fuck you cannot fuck she cannot fuck we cannot fuck you cannot fuck they cannot fuck
V-ing form
I cannot be fucking you cannot be fucking she cannot be fucking we cannot be fucking you cannot be fucking they cannot be fucking
Perfect
I cannot have fucked you cannot have fucked she cannot have fucked we cannot have fucked you cannot have fucked they cannot have fucked
V-ing perfect
I cannot have been fucking you cannot have been fucking she cannot have been fucking we cannot have been fucking you cannot have been fucking they cannot have been fucking
Interrogative form
Simple form
can I fuck? can you fuck? can she fuck? can we fuck? can you fuck? can they fuck?
V-ing form
can I be fucking? can you be fucking? can she be fucking? can we be fucking? can you be fucking? can they be fucking?
Perfect
can I have fucked? can you have fucked? can she 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 she have been fucking? can we have been fucking? can you have been fucking? can they have been fucking?
Interro-negative form
Simple form
can I not fuck? can you not fuck? can she not fuck? can we not fuck? can you not fuck? can they not fuck?
V-ing form
can I not be fucking? can you not be fucking? can she not be fucking? can we not be fucking? can you not be fucking? can they not be fucking?
Perfect
can I not have fucked? can you not have fucked? can she not have fucked? can we not have fucked? can you not have fucked? can they not have fucked?
V-ing perfect
can I not have been fucking? can you not have been fucking? can she not have been fucking? can we not have been fucking? can you not have been fucking? can they not have been fucking?