could cross-reference
Regular verb: cross-reference - cross-referenced- cross-referenced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could cross-reference
you could cross-reference
he could cross-reference
we could cross-reference
you could cross-reference
they could cross-reference 	I could be cross-referencing
you could be cross-referencing
he could be cross-referencing
we could be cross-referencing
you could be cross-referencing
they could be cross-referencing	I could have cross-referenced
you could have cross-referenced
he could have cross-referenced
we could have cross-referenced
you could have cross-referenced
they could have cross-referenced	I could have been cross-referencing
you could have been cross-referencing
he could have been cross-referencing
we could have been cross-referencing
you could have been cross-referencing
they could have been cross-referencing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't cross-reference
you couldn't cross-reference
he couldn't cross-reference
we couldn't cross-reference
you couldn't cross-reference
they couldn't cross-reference 	I couldn't be cross-referencing
you couldn't be cross-referencing
he couldn't be cross-referencing
we couldn't be cross-referencing
you couldn't be cross-referencing
they couldn't be cross-referencing	I couldn't have cross-referenced
you couldn't have cross-referenced
he couldn't have cross-referenced
we couldn't have cross-referenced
you couldn't have cross-referenced
they couldn't have cross-referenced	I couldn't have been cross-referencing
you couldn't have been cross-referencing
he couldn't have been cross-referencing
we couldn't have been cross-referencing
you couldn't have been cross-referencing
they couldn't have been cross-referencing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I cross-reference?
could you cross-reference?
could he cross-reference?
could we cross-reference?
could you cross-reference?
could they cross-reference? 	could I be cross-referencing?
could you be cross-referencing?
could he be cross-referencing?
could we be cross-referencing?
could you be cross-referencing?
could they be cross-referencing? 	could I have cross-referenced?
could you have cross-referenced?
could he have cross-referenced?
could we have cross-referenced?
could you have cross-referenced?
could they have cross-referenced? 	could I have been cross-referencing?
could you have been cross-referencing?
could he have been cross-referencing?
could we have been cross-referencing?
could you have been cross-referencing?
could they have been cross-referencing? 	

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