I can coast you can coast he can coast we can coast you can coast they can coast
V-ing form
I can be coasting you can be coasting he can be coasting we can be coasting you can be coasting they can be coasting
Perfect
I can have coasted you can have coasted he can have coasted we can have coasted you can have coasted they can have coasted
V-ing perfect
I can have been coasting you can have been coasting he can have been coasting we can have been coasting you can have been coasting they can have been coasting
Negation
Simple form
I cannot coast you cannot coast he cannot coast we cannot coast you cannot coast they cannot coast
V-ing form
I cannot be coasting you cannot be coasting he cannot be coasting we cannot be coasting you cannot be coasting they cannot be coasting
Perfect
I cannot have coasted you cannot have coasted he cannot have coasted we cannot have coasted you cannot have coasted they cannot have coasted
V-ing perfect
I cannot have been coasting you cannot have been coasting he cannot have been coasting we cannot have been coasting you cannot have been coasting they cannot have been coasting
Interrogative form
Simple form
can I coast? can you coast? can he coast? can we coast? can you coast? can they coast?
V-ing form
can I be coasting? can you be coasting? can he be coasting? can we be coasting? can you be coasting? can they be coasting?
Perfect
can I have coasted? can you have coasted? can he have coasted? can we have coasted? can you have coasted? can they have coasted?
V-ing perfect
can I have been coasting? can you have been coasting? can he have been coasting? can we have been coasting? can you have been coasting? can they have been coasting?
Interro-negative form
Simple form
can I not coast? can you not coast? can he not coast? can we not coast? can you not coast? can they not coast?
V-ing form
can I not be coasting? can you not be coasting? can he not be coasting? can we not be coasting? can you not be coasting? can they not be coasting?
Perfect
can I not have coasted? can you not have coasted? can he not have coasted? can we not have coasted? can you not have coasted? can they not have coasted?
V-ing perfect
can I not have been coasting? can you not have been coasting? can he not have been coasting? can we not have been coasting? can you not have been coasting? can they not have been coasting?