I can muss you can muss he can muss we can muss you can muss they can muss
V-ing form
I can be mussing you can be mussing he can be mussing we can be mussing you can be mussing they can be mussing
Perfect
I can have mussed you can have mussed he can have mussed we can have mussed you can have mussed they can have mussed
V-ing perfect
I can have been mussing you can have been mussing he can have been mussing we can have been mussing you can have been mussing they can have been mussing
Negation
Simple form
I cannot muss you cannot muss he cannot muss we cannot muss you cannot muss they cannot muss
V-ing form
I cannot be mussing you cannot be mussing he cannot be mussing we cannot be mussing you cannot be mussing they cannot be mussing
Perfect
I cannot have mussed you cannot have mussed he cannot have mussed we cannot have mussed you cannot have mussed they cannot have mussed
V-ing perfect
I cannot have been mussing you cannot have been mussing he cannot have been mussing we cannot have been mussing you cannot have been mussing they cannot have been mussing
Interrogative form
Simple form
can I muss? can you muss? can he muss? can we muss? can you muss? can they muss?
V-ing form
can I be mussing? can you be mussing? can he be mussing? can we be mussing? can you be mussing? can they be mussing?
Perfect
can I have mussed? can you have mussed? can he have mussed? can we have mussed? can you have mussed? can they have mussed?
V-ing perfect
can I have been mussing? can you have been mussing? can he have been mussing? can we have been mussing? can you have been mussing? can they have been mussing?
Interro-negative form
Simple form
can I not muss? can you not muss? can he not muss? can we not muss? can you not muss? can they not muss?
V-ing form
can I not be mussing? can you not be mussing? can he not be mussing? can we not be mussing? can you not be mussing? can they not be mussing?
Perfect
can I not have mussed? can you not have mussed? can he not have mussed? can we not have mussed? can you not have mussed? can they not have mussed?
V-ing perfect
can I not have been mussing? can you not have been mussing? can he not have been mussing? can we not have been mussing? can you not have been mussing? can they not have been mussing?