I can order you can order she can order we can order you can order they can order
V-ing form
I can be ordering you can be ordering she can be ordering we can be ordering you can be ordering they can be ordering
Perfect
I can have ordered you can have ordered she can have ordered we can have ordered you can have ordered they can have ordered
V-ing perfect
I can have been ordering you can have been ordering she can have been ordering we can have been ordering you can have been ordering they can have been ordering
Negation
Simple form
I cannot order you cannot order she cannot order we cannot order you cannot order they cannot order
V-ing form
I cannot be ordering you cannot be ordering she cannot be ordering we cannot be ordering you cannot be ordering they cannot be ordering
Perfect
I cannot have ordered you cannot have ordered she cannot have ordered we cannot have ordered you cannot have ordered they cannot have ordered
V-ing perfect
I cannot have been ordering you cannot have been ordering she cannot have been ordering we cannot have been ordering you cannot have been ordering they cannot have been ordering
Interrogative form
Simple form
can I order? can you order? can she order? can we order? can you order? can they order?
V-ing form
can I be ordering? can you be ordering? can she be ordering? can we be ordering? can you be ordering? can they be ordering?
Perfect
can I have ordered? can you have ordered? can she have ordered? can we have ordered? can you have ordered? can they have ordered?
V-ing perfect
can I have been ordering? can you have been ordering? can she have been ordering? can we have been ordering? can you have been ordering? can they have been ordering?
Interro-negative form
Simple form
can I not order? can you not order? can she not order? can we not order? can you not order? can they not order?
V-ing form
can I not be ordering? can you not be ordering? can she not be ordering? can we not be ordering? can you not be ordering? can they not be ordering?
Perfect
can I not have ordered? can you not have ordered? can she not have ordered? can we not have ordered? can you not have ordered? can they not have ordered?
V-ing perfect
can I not have been ordering? can you not have been ordering? can she not have been ordering? can we not have been ordering? can you not have been ordering? can they not have been ordering?