I can gross you can gross he can gross we can gross you can gross they can gross
V-ing form
I can be grossing you can be grossing he can be grossing we can be grossing you can be grossing they can be grossing
Perfect
I can have grossed you can have grossed he can have grossed we can have grossed you can have grossed they can have grossed
V-ing perfect
I can have been grossing you can have been grossing he can have been grossing we can have been grossing you can have been grossing they can have been grossing
Negation
Simple form
I can't gross you can't gross he can't gross we can't gross you can't gross they can't gross
V-ing form
I can't be grossing you can't be grossing he can't be grossing we can't be grossing you can't be grossing they can't be grossing
Perfect
I can't have grossed you can't have grossed he can't have grossed we can't have grossed you can't have grossed they can't have grossed
V-ing perfect
I can't have been grossing you can't have been grossing he can't have been grossing we can't have been grossing you can't have been grossing they can't have been grossing
Interrogative form
Simple form
can I gross? can you gross? can he gross? can we gross? can you gross? can they gross?
V-ing form
can I be grossing? can you be grossing? can he be grossing? can we be grossing? can you be grossing? can they be grossing?
Perfect
can I have grossed? can you have grossed? can he have grossed? can we have grossed? can you have grossed? can they have grossed?
V-ing perfect
can I have been grossing? can you have been grossing? can he have been grossing? can we have been grossing? can you have been grossing? can they have been grossing?
Interro-negative form
Simple form
can't I gross? can't you gross? can't he gross? can't we gross? can't you gross? can't they gross?
V-ing form
can't I be grossing? can't you be grossing? can't he be grossing? can't we be grossing? can't you be grossing? can't they be grossing?
Perfect
can't I have grossed? can't you have grossed? can't he have grossed? can't we have grossed? can't you have grossed? can't they have grossed?
V-ing perfect
can't I have been grossing? can't you have been grossing? can't he have been grossing? can't we have been grossing? can't you have been grossing? can't they have been grossing?