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 cannot coal you cannot coal he cannot coal we cannot coal you cannot coal they cannot coal
V-ing form
I cannot be coaling you cannot be coaling he cannot be coaling we cannot be coaling you cannot be coaling they cannot be coaling
Perfect
I cannot have coaled you cannot have coaled he cannot have coaled we cannot have coaled you cannot have coaled they cannot have coaled
V-ing perfect
I cannot have been coaling you cannot have been coaling he cannot have been coaling we cannot have been coaling you cannot have been coaling they cannot 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 I not coal? can you not coal? can he not coal? can we not coal? can you not coal? can they not coal?
V-ing form
can I not be coaling? can you not be coaling? can he not be coaling? can we not be coaling? can you not be coaling? can they not be coaling?
Perfect
can I not have coaled? can you not have coaled? can he not have coaled? can we not have coaled? can you not have coaled? can they not have coaled?
V-ing perfect
can I not have been coaling? can you not have been coaling? can he not have been coaling? can we not have been coaling? can you not have been coaling? can they not have been coaling?