I can degenerate you can degenerate she can degenerate we can degenerate you can degenerate they can degenerate
V-ing form
I can be degenerating you can be degenerating she can be degenerating we can be degenerating you can be degenerating they can be degenerating
Perfect
I can have degenerated you can have degenerated she can have degenerated we can have degenerated you can have degenerated they can have degenerated
V-ing perfect
I can have been degenerating you can have been degenerating she can have been degenerating we can have been degenerating you can have been degenerating they can have been degenerating
Negation
Simple form
I cannot degenerate you cannot degenerate she cannot degenerate we cannot degenerate you cannot degenerate they cannot degenerate
V-ing form
I cannot be degenerating you cannot be degenerating she cannot be degenerating we cannot be degenerating you cannot be degenerating they cannot be degenerating
Perfect
I cannot have degenerated you cannot have degenerated she cannot have degenerated we cannot have degenerated you cannot have degenerated they cannot have degenerated
V-ing perfect
I cannot have been degenerating you cannot have been degenerating she cannot have been degenerating we cannot have been degenerating you cannot have been degenerating they cannot have been degenerating
Interrogative form
Simple form
can I degenerate? can you degenerate? can she degenerate? can we degenerate? can you degenerate? can they degenerate?
V-ing form
can I be degenerating? can you be degenerating? can she be degenerating? can we be degenerating? can you be degenerating? can they be degenerating?
Perfect
can I have degenerated? can you have degenerated? can she have degenerated? can we have degenerated? can you have degenerated? can they have degenerated?
V-ing perfect
can I have been degenerating? can you have been degenerating? can she have been degenerating? can we have been degenerating? can you have been degenerating? can they have been degenerating?
Interro-negative form
Simple form
can I not degenerate? can you not degenerate? can she not degenerate? can we not degenerate? can you not degenerate? can they not degenerate?
V-ing form
can I not be degenerating? can you not be degenerating? can she not be degenerating? can we not be degenerating? can you not be degenerating? can they not be degenerating?
Perfect
can I not have degenerated? can you not have degenerated? can she not have degenerated? can we not have degenerated? can you not have degenerated? can they not have degenerated?
V-ing perfect
can I not have been degenerating? can you not have been degenerating? can she not have been degenerating? can we not have been degenerating? can you not have been degenerating? can they not have been degenerating?