I can coffer you can coffer he can coffer we can coffer you can coffer they can coffer
V-ing form
I can be coffering you can be coffering he can be coffering we can be coffering you can be coffering they can be coffering
Perfect
I can have coffered you can have coffered he can have coffered we can have coffered you can have coffered they can have coffered
V-ing perfect
I can have been coffering you can have been coffering he can have been coffering we can have been coffering you can have been coffering they can have been coffering
Negation
Simple form
I cannot coffer you cannot coffer he cannot coffer we cannot coffer you cannot coffer they cannot coffer
V-ing form
I cannot be coffering you cannot be coffering he cannot be coffering we cannot be coffering you cannot be coffering they cannot be coffering
Perfect
I cannot have coffered you cannot have coffered he cannot have coffered we cannot have coffered you cannot have coffered they cannot have coffered
V-ing perfect
I cannot have been coffering you cannot have been coffering he cannot have been coffering we cannot have been coffering you cannot have been coffering they cannot have been coffering
Interrogative form
Simple form
can I coffer? can you coffer? can he coffer? can we coffer? can you coffer? can they coffer?
V-ing form
can I be coffering? can you be coffering? can he be coffering? can we be coffering? can you be coffering? can they be coffering?
Perfect
can I have coffered? can you have coffered? can he have coffered? can we have coffered? can you have coffered? can they have coffered?
V-ing perfect
can I have been coffering? can you have been coffering? can he have been coffering? can we have been coffering? can you have been coffering? can they have been coffering?
Interro-negative form
Simple form
can I not coffer? can you not coffer? can he not coffer? can we not coffer? can you not coffer? can they not coffer?
V-ing form
can I not be coffering? can you not be coffering? can he not be coffering? can we not be coffering? can you not be coffering? can they not be coffering?
Perfect
can I not have coffered? can you not have coffered? can he not have coffered? can we not have coffered? can you not have coffered? can they not have coffered?
V-ing perfect
can I not have been coffering? can you not have been coffering? can he not have been coffering? can we not have been coffering? can you not have been coffering? can they not have been coffering?