I can forfeit you can forfeit she can forfeit we can forfeit you can forfeit they can forfeit
V-ing form
I can be forfeiting you can be forfeiting she can be forfeiting we can be forfeiting you can be forfeiting they can be forfeiting
Perfect
I can have forfeited you can have forfeited she can have forfeited we can have forfeited you can have forfeited they can have forfeited
V-ing perfect
I can have been forfeiting you can have been forfeiting she can have been forfeiting we can have been forfeiting you can have been forfeiting they can have been forfeiting
Negation
Simple form
I cannot forfeit you cannot forfeit she cannot forfeit we cannot forfeit you cannot forfeit they cannot forfeit
V-ing form
I cannot be forfeiting you cannot be forfeiting she cannot be forfeiting we cannot be forfeiting you cannot be forfeiting they cannot be forfeiting
Perfect
I cannot have forfeited you cannot have forfeited she cannot have forfeited we cannot have forfeited you cannot have forfeited they cannot have forfeited
V-ing perfect
I cannot have been forfeiting you cannot have been forfeiting she cannot have been forfeiting we cannot have been forfeiting you cannot have been forfeiting they cannot have been forfeiting
Interrogative form
Simple form
can I forfeit? can you forfeit? can she forfeit? can we forfeit? can you forfeit? can they forfeit?
V-ing form
can I be forfeiting? can you be forfeiting? can she be forfeiting? can we be forfeiting? can you be forfeiting? can they be forfeiting?
Perfect
can I have forfeited? can you have forfeited? can she have forfeited? can we have forfeited? can you have forfeited? can they have forfeited?
V-ing perfect
can I have been forfeiting? can you have been forfeiting? can she have been forfeiting? can we have been forfeiting? can you have been forfeiting? can they have been forfeiting?
Interro-negative form
Simple form
can I not forfeit? can you not forfeit? can she not forfeit? can we not forfeit? can you not forfeit? can they not forfeit?
V-ing form
can I not be forfeiting? can you not be forfeiting? can she not be forfeiting? can we not be forfeiting? can you not be forfeiting? can they not be forfeiting?
Perfect
can I not have forfeited? can you not have forfeited? can she not have forfeited? can we not have forfeited? can you not have forfeited? can they not have forfeited?
V-ing perfect
can I not have been forfeiting? can you not have been forfeiting? can she not have been forfeiting? can we not have been forfeiting? can you not have been forfeiting? can they not have been forfeiting?