I can reference you can reference he can reference we can reference you can reference they can reference
V-ing form
I can be referencing you can be referencing he can be referencing we can be referencing you can be referencing they can be referencing
Perfect
I can have referenced you can have referenced he can have referenced we can have referenced you can have referenced they can have referenced
V-ing perfect
I can have been referencing you can have been referencing he can have been referencing we can have been referencing you can have been referencing they can have been referencing
Negation
Simple form
I can't reference you can't reference he can't reference we can't reference you can't reference they can't reference
V-ing form
I can't be referencing you can't be referencing he can't be referencing we can't be referencing you can't be referencing they can't be referencing
Perfect
I can't have referenced you can't have referenced he can't have referenced we can't have referenced you can't have referenced they can't have referenced
V-ing perfect
I can't have been referencing you can't have been referencing he can't have been referencing we can't have been referencing you can't have been referencing they can't have been referencing
Interrogative form
Simple form
can I reference? can you reference? can he reference? can we reference? can you reference? can they reference?
V-ing form
can I be referencing? can you be referencing? can he be referencing? can we be referencing? can you be referencing? can they be referencing?
Perfect
can I have referenced? can you have referenced? can he have referenced? can we have referenced? can you have referenced? can they have referenced?
V-ing perfect
can I have been referencing? can you have been referencing? can he have been referencing? can we have been referencing? can you have been referencing? can they have been referencing?
Interro-negative form
Simple form
can't I reference? can't you reference? can't he reference? can't we reference? can't you reference? can't they reference?
V-ing form
can't I be referencing? can't you be referencing? can't he be referencing? can't we be referencing? can't you be referencing? can't they be referencing?
Perfect
can't I have referenced? can't you have referenced? can't he have referenced? can't we have referenced? can't you have referenced? can't they have referenced?
V-ing perfect
can't I have been referencing? can't you have been referencing? can't he have been referencing? can't we have been referencing? can't you have been referencing? can't they have been referencing?