English verb conjugation
CAN REFERENCE

Regular verb: reference - referenced - referenced

Affirmation

Simple form	V-ing form
I can reference you can reference he can reference we can reference you can reference they can reference	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
can I reference? can you reference? can he reference? can we reference? can you reference? can they reference?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?