I could deliver you could deliver he could deliver we could deliver you could deliver they could deliver
V-ing form
I could be delivering you could be delivering he could be delivering we could be delivering you could be delivering they could be delivering
Perfect
I could have delivered you could have delivered he could have delivered we could have delivered you could have delivered they could have delivered
V-ing perfect
I could have been delivering you could have been delivering he could have been delivering we could have been delivering you could have been delivering they could have been delivering
Negation
Simple form
I could not deliver you could not deliver he could not deliver we could not deliver you could not deliver they could not deliver
V-ing form
I could not be delivering you could not be delivering he could not be delivering we could not be delivering you could not be delivering they could not be delivering
Perfect
I could not have delivered you could not have delivered he could not have delivered we could not have delivered you could not have delivered they could not have delivered
V-ing perfect
I could not have been delivering you could not have been delivering he could not have been delivering we could not have been delivering you could not have been delivering they could not have been delivering
Interrogative form
Simple form
could I deliver? could you deliver? could he deliver? could we deliver? could you deliver? could they deliver?
V-ing form
could I be delivering? could you be delivering? could he be delivering? could we be delivering? could you be delivering? could they be delivering?
Perfect
could I have delivered? could you have delivered? could he have delivered? could we have delivered? could you have delivered? could they have delivered?
V-ing perfect
could I have been delivering? could you have been delivering? could he have been delivering? could we have been delivering? could you have been delivering? could they have been delivering?
Interro-negative form
Simple form
could I not deliver? could you not deliver? could he not deliver? could we not deliver? could you not deliver? could they not deliver?
V-ing form
could I not be delivering? could you not be delivering? could he not be delivering? could we not be delivering? could you not be delivering? could they not be delivering?
Perfect
could I not have delivered? could you not have delivered? could he not have delivered? could we not have delivered? could you not have delivered? could they not have delivered?
V-ing perfect
could I not have been delivering? could you not have been delivering? could he not have been delivering? could we not have been delivering? could you not have been delivering? could they not have been delivering?