can reference
Regular verb: reference - referenced- referenced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?