I can order you can order he can order we can order you can order they can order
V-ing form
I can be ordering you can be ordering he can be ordering we can be ordering you can be ordering they can be ordering
Perfect
I can have ordered you can have ordered he 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 he can have been ordering we can have been ordering you can have been ordering they can have been ordering
Negation
Simple form
I can't order you can't order he can't order we can't order you can't order they can't order
V-ing form
I can't be ordering you can't be ordering he can't be ordering we can't be ordering you can't be ordering they can't be ordering
Perfect
I can't have ordered you can't have ordered he can't have ordered we can't have ordered you can't have ordered they can't have ordered
V-ing perfect
I can't have been ordering you can't have been ordering he can't have been ordering we can't have been ordering you can't have been ordering they can't have been ordering
Interrogative form
Simple form
can I order? can you order? can he order? can we order? can you order? can they order?
V-ing form
can I be ordering? can you be ordering? can he be ordering? can we be ordering? can you be ordering? can they be ordering?
Perfect
can I have ordered? can you have ordered? can he 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 he have been ordering? can we have been ordering? can you have been ordering? can they have been ordering?
Interro-negative form
Simple form
can't I order? can't you order? can't he order? can't we order? can't you order? can't they order?
V-ing form
can't I be ordering? can't you be ordering? can't he be ordering? can't we be ordering? can't you be ordering? can't they be ordering?
Perfect
can't I have ordered? can't you have ordered? can't he have ordered? can't we have ordered? can't you have ordered? can't they have ordered?
V-ing perfect
can't I have been ordering? can't you have been ordering? can't he have been ordering? can't we have been ordering? can't you have been ordering? can't they have been ordering?