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