I can moss you can moss he can moss we can moss you can moss they can moss
V-ing form
I can be mossing you can be mossing he can be mossing we can be mossing you can be mossing they can be mossing
Perfect
I can have mossed you can have mossed he can have mossed we can have mossed you can have mossed they can have mossed
V-ing perfect
I can have been mossing you can have been mossing he can have been mossing we can have been mossing you can have been mossing they can have been mossing
Negation
Simple form
I can't moss you can't moss he can't moss we can't moss you can't moss they can't moss
V-ing form
I can't be mossing you can't be mossing he can't be mossing we can't be mossing you can't be mossing they can't be mossing
Perfect
I can't have mossed you can't have mossed he can't have mossed we can't have mossed you can't have mossed they can't have mossed
V-ing perfect
I can't have been mossing you can't have been mossing he can't have been mossing we can't have been mossing you can't have been mossing they can't have been mossing
Interrogative form
Simple form
can I moss? can you moss? can he moss? can we moss? can you moss? can they moss?
V-ing form
can I be mossing? can you be mossing? can he be mossing? can we be mossing? can you be mossing? can they be mossing?
Perfect
can I have mossed? can you have mossed? can he have mossed? can we have mossed? can you have mossed? can they have mossed?
V-ing perfect
can I have been mossing? can you have been mossing? can he have been mossing? can we have been mossing? can you have been mossing? can they have been mossing?
Interro-negative form
Simple form
can't I moss? can't you moss? can't he moss? can't we moss? can't you moss? can't they moss?
V-ing form
can't I be mossing? can't you be mossing? can't he be mossing? can't we be mossing? can't you be mossing? can't they be mossing?
Perfect
can't I have mossed? can't you have mossed? can't he have mossed? can't we have mossed? can't you have mossed? can't they have mossed?
V-ing perfect
can't I have been mossing? can't you have been mossing? can't he have been mossing? can't we have been mossing? can't you have been mossing? can't they have been mossing?