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