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