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 can't muss you can't muss he can't muss we can't muss you can't muss they can't muss
V-ing form
I can't be mussing you can't be mussing he can't be mussing we can't be mussing you can't be mussing they can't be mussing
Perfect
I can't have mussed you can't have mussed he can't have mussed we can't have mussed you can't have mussed they can't have mussed
V-ing perfect
I can't have been mussing you can't have been mussing he can't have been mussing we can't have been mussing you can't have been mussing they can't 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't I muss? can't you muss? can't he muss? can't we muss? can't you muss? can't they muss?
V-ing form
can't I be mussing? can't you be mussing? can't he be mussing? can't we be mussing? can't you be mussing? can't they be mussing?
Perfect
can't I have mussed? can't you have mussed? can't he have mussed? can't we have mussed? can't you have mussed? can't they have mussed?
V-ing perfect
can't I have been mussing? can't you have been mussing? can't he have been mussing? can't we have been mussing? can't you have been mussing? can't they have been mussing?