I can coal you can coal he can coal we can coal you can coal they can coal
V-ing form
I can be coaling you can be coaling he can be coaling we can be coaling you can be coaling they can be coaling
Perfect
I can have coaled you can have coaled he can have coaled we can have coaled you can have coaled they can have coaled
V-ing perfect
I can have been coaling you can have been coaling he can have been coaling we can have been coaling you can have been coaling they can have been coaling
Negation
Simple form
I can't coal you can't coal he can't coal we can't coal you can't coal they can't coal
V-ing form
I can't be coaling you can't be coaling he can't be coaling we can't be coaling you can't be coaling they can't be coaling
Perfect
I can't have coaled you can't have coaled he can't have coaled we can't have coaled you can't have coaled they can't have coaled
V-ing perfect
I can't have been coaling you can't have been coaling he can't have been coaling we can't have been coaling you can't have been coaling they can't have been coaling
Interrogative form
Simple form
can I coal? can you coal? can he coal? can we coal? can you coal? can they coal?
V-ing form
can I be coaling? can you be coaling? can he be coaling? can we be coaling? can you be coaling? can they be coaling?
Perfect
can I have coaled? can you have coaled? can he have coaled? can we have coaled? can you have coaled? can they have coaled?
V-ing perfect
can I have been coaling? can you have been coaling? can he have been coaling? can we have been coaling? can you have been coaling? can they have been coaling?
Interro-negative form
Simple form
can't I coal? can't you coal? can't he coal? can't we coal? can't you coal? can't they coal?
V-ing form
can't I be coaling? can't you be coaling? can't he be coaling? can't we be coaling? can't you be coaling? can't they be coaling?
Perfect
can't I have coaled? can't you have coaled? can't he have coaled? can't we have coaled? can't you have coaled? can't they have coaled?
V-ing perfect
can't I have been coaling? can't you have been coaling? can't he have been coaling? can't we have been coaling? can't you have been coaling? can't they have been coaling?