could delete
Regular verb: delete - deleted- deleted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could delete
you could delete
he could delete
we could delete
you could delete
they could delete 	I could be deleting
you could be deleting
he could be deleting
we could be deleting
you could be deleting
they could be deleting	I could have deleted
you could have deleted
he could have deleted
we could have deleted
you could have deleted
they could have deleted	I could have been deleting
you could have been deleting
he could have been deleting
we could have been deleting
you could have been deleting
they could have been deleting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't delete
you couldn't delete
he couldn't delete
we couldn't delete
you couldn't delete
they couldn't delete 	I couldn't be deleting
you couldn't be deleting
he couldn't be deleting
we couldn't be deleting
you couldn't be deleting
they couldn't be deleting	I couldn't have deleted
you couldn't have deleted
he couldn't have deleted
we couldn't have deleted
you couldn't have deleted
they couldn't have deleted	I couldn't have been deleting
you couldn't have been deleting
he couldn't have been deleting
we couldn't have been deleting
you couldn't have been deleting
they couldn't have been deleting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I delete?
could you delete?
could he delete?
could we delete?
could you delete?
could they delete? 	could I be deleting?
could you be deleting?
could he be deleting?
could we be deleting?
could you be deleting?
could they be deleting? 	could I have deleted?
could you have deleted?
could he have deleted?
could we have deleted?
could you have deleted?
could they have deleted? 	could I have been deleting?
could you have been deleting?
could he have been deleting?
could we have been deleting?
could you have been deleting?
could they have been deleting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I delete?
couldn't you delete?
couldn't he delete?
couldn't we delete?
couldn't you delete?
couldn't they delete? 	couldn't I be deleting?
couldn't you be deleting?
couldn't he be deleting?
couldn't we be deleting?
couldn't you be deleting?
couldn't they be deleting? 	couldn't I have deleted?
couldn't you have deleted?
couldn't he have deleted?
couldn't we have deleted?
couldn't you have deleted?
couldn't they have deleted? 	couldn't I have been deleting?
couldn't you have been deleting?
couldn't he have been deleting?
couldn't we have been deleting?
couldn't you have been deleting?
couldn't they have been deleting?