I can degenerate you can degenerate he can degenerate we can degenerate you can degenerate they can degenerate
V-ing form
I can be degenerating you can be degenerating he can be degenerating we can be degenerating you can be degenerating they can be degenerating
Perfect
I can have degenerated you can have degenerated he 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 he can have been degenerating we can have been degenerating you can have been degenerating they can have been degenerating
Negation
Simple form
I can't degenerate you can't degenerate he can't degenerate we can't degenerate you can't degenerate they can't degenerate
V-ing form
I can't be degenerating you can't be degenerating he can't be degenerating we can't be degenerating you can't be degenerating they can't be degenerating
Perfect
I can't have degenerated you can't have degenerated he can't have degenerated we can't have degenerated you can't have degenerated they can't have degenerated
V-ing perfect
I can't have been degenerating you can't have been degenerating he can't have been degenerating we can't have been degenerating you can't have been degenerating they can't have been degenerating
Interrogative form
Simple form
can I degenerate? can you degenerate? can he degenerate? can we degenerate? can you degenerate? can they degenerate?
V-ing form
can I be degenerating? can you be degenerating? can he be degenerating? can we be degenerating? can you be degenerating? can they be degenerating?
Perfect
can I have degenerated? can you have degenerated? can he 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 he have been degenerating? can we have been degenerating? can you have been degenerating? can they have been degenerating?
Interro-negative form
Simple form
can't I degenerate? can't you degenerate? can't he degenerate? can't we degenerate? can't you degenerate? can't they degenerate?
V-ing form
can't I be degenerating? can't you be degenerating? can't he be degenerating? can't we be degenerating? can't you be degenerating? can't they be degenerating?
Perfect
can't I have degenerated? can't you have degenerated? can't he have degenerated? can't we have degenerated? can't you have degenerated? can't they have degenerated?
V-ing perfect
can't I have been degenerating? can't you have been degenerating? can't he have been degenerating? can't we have been degenerating? can't you have been degenerating? can't they have been degenerating?