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