I could request you could request she could request we could request you could request they could request
V-ing form
I could be requesting you could be requesting she could be requesting we could be requesting you could be requesting they could be requesting
Perfect
I could have requested you could have requested she could have requested we could have requested you could have requested they could have requested
V-ing perfect
I could have been requesting you could have been requesting she could have been requesting we could have been requesting you could have been requesting they could have been requesting
Negation
Simple form
I could not request you could not request she could not request we could not request you could not request they could not request
V-ing form
I could not be requesting you could not be requesting she could not be requesting we could not be requesting you could not be requesting they could not be requesting
Perfect
I could not have requested you could not have requested she could not have requested we could not have requested you could not have requested they could not have requested
V-ing perfect
I could not have been requesting you could not have been requesting she could not have been requesting we could not have been requesting you could not have been requesting they could not have been requesting
Interrogative form
Simple form
could I request? could you request? could she request? could we request? could you request? could they request?
V-ing form
could I be requesting? could you be requesting? could she be requesting? could we be requesting? could you be requesting? could they be requesting?
Perfect
could I have requested? could you have requested? could she have requested? could we have requested? could you have requested? could they have requested?
V-ing perfect
could I have been requesting? could you have been requesting? could she have been requesting? could we have been requesting? could you have been requesting? could they have been requesting?
Interro-negative form
Simple form
could I not request? could you not request? could she not request? could we not request? could you not request? could they not request?
V-ing form
could I not be requesting? could you not be requesting? could she not be requesting? could we not be requesting? could you not be requesting? could they not be requesting?
Perfect
could I not have requested? could you not have requested? could she not have requested? could we not have requested? could you not have requested? could they not have requested?
V-ing perfect
could I not have been requesting? could you not have been requesting? could she not have been requesting? could we not have been requesting? could you not have been requesting? could they not have been requesting?