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 couldn't request you couldn't request she couldn't request we couldn't request you couldn't request they couldn't request
V-ing form
I couldn't be requesting you couldn't be requesting she couldn't be requesting we couldn't be requesting you couldn't be requesting they couldn't be requesting
Perfect
I couldn't have requested you couldn't have requested she couldn't have requested we couldn't have requested you couldn't have requested they couldn't have requested
V-ing perfect
I couldn't have been requesting you couldn't have been requesting she couldn't have been requesting we couldn't have been requesting you couldn't have been requesting they couldn't 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
couldn't I request? couldn't you request? couldn't she request? couldn't we request? couldn't you request? couldn't they request?
V-ing form
couldn't I be requesting? couldn't you be requesting? couldn't she be requesting? couldn't we be requesting? couldn't you be requesting? couldn't they be requesting?
Perfect
couldn't I have requested? couldn't you have requested? couldn't she have requested? couldn't we have requested? couldn't you have requested? couldn't they have requested?
V-ing perfect
couldn't I have been requesting? couldn't you have been requesting? couldn't she have been requesting? couldn't we have been requesting? couldn't you have been requesting? couldn't they have been requesting?