could surname
Regular verb: surname - surnamed- surnamed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could surname
you could surname
he could surname
we could surname
you could surname
they could surname 	I could be surnaming
you could be surnaming
he could be surnaming
we could be surnaming
you could be surnaming
they could be surnaming	I could have surnamed
you could have surnamed
he could have surnamed
we could have surnamed
you could have surnamed
they could have surnamed	I could have been surnaming
you could have been surnaming
he could have been surnaming
we could have been surnaming
you could have been surnaming
they could have been surnaming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't surname
you couldn't surname
he couldn't surname
we couldn't surname
you couldn't surname
they couldn't surname 	I couldn't be surnaming
you couldn't be surnaming
he couldn't be surnaming
we couldn't be surnaming
you couldn't be surnaming
they couldn't be surnaming	I couldn't have surnamed
you couldn't have surnamed
he couldn't have surnamed
we couldn't have surnamed
you couldn't have surnamed
they couldn't have surnamed	I couldn't have been surnaming
you couldn't have been surnaming
he couldn't have been surnaming
we couldn't have been surnaming
you couldn't have been surnaming
they couldn't have been surnaming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I surname?
could you surname?
could he surname?
could we surname?
could you surname?
could they surname? 	could I be surnaming?
could you be surnaming?
could he be surnaming?
could we be surnaming?
could you be surnaming?
could they be surnaming? 	could I have surnamed?
could you have surnamed?
could he have surnamed?
could we have surnamed?
could you have surnamed?
could they have surnamed? 	could I have been surnaming?
could you have been surnaming?
could he have been surnaming?
could we have been surnaming?
could you have been surnaming?
could they have been surnaming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I surname?
couldn't you surname?
couldn't he surname?
couldn't we surname?
couldn't you surname?
couldn't they surname? 	couldn't I be surnaming?
couldn't you be surnaming?
couldn't he be surnaming?
couldn't we be surnaming?
couldn't you be surnaming?
couldn't they be surnaming? 	couldn't I have surnamed?
couldn't you have surnamed?
couldn't he have surnamed?
couldn't we have surnamed?
couldn't you have surnamed?
couldn't they have surnamed? 	couldn't I have been surnaming?
couldn't you have been surnaming?
couldn't he have been surnaming?
couldn't we have been surnaming?
couldn't you have been surnaming?
couldn't they have been surnaming?