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 cannot moss you cannot moss he cannot moss we cannot moss you cannot moss they cannot moss
V-ing form
I cannot be mossing you cannot be mossing he cannot be mossing we cannot be mossing you cannot be mossing they cannot be mossing
Perfect
I cannot have mossed you cannot have mossed he cannot have mossed we cannot have mossed you cannot have mossed they cannot have mossed
V-ing perfect
I cannot have been mossing you cannot have been mossing he cannot have been mossing we cannot have been mossing you cannot have been mossing they cannot 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 I not moss? can you not moss? can he not moss? can we not moss? can you not moss? can they not moss?
V-ing form
can I not be mossing? can you not be mossing? can he not be mossing? can we not be mossing? can you not be mossing? can they not be mossing?
Perfect
can I not have mossed? can you not have mossed? can he not have mossed? can we not have mossed? can you not have mossed? can they not have mossed?
V-ing perfect
can I not have been mossing? can you not have been mossing? can he not have been mossing? can we not have been mossing? can you not have been mossing? can they not have been mossing?