I can ret you can ret he can ret we can ret you can ret they can ret
V-ing form
I can be retting you can be retting he can be retting we can be retting you can be retting they can be retting
Perfect
I can have retted you can have retted he can have retted we can have retted you can have retted they can have retted
V-ing perfect
I can have been retting you can have been retting he can have been retting we can have been retting you can have been retting they can have been retting
Negation
Simple form
I can't ret you can't ret he can't ret we can't ret you can't ret they can't ret
V-ing form
I can't be retting you can't be retting he can't be retting we can't be retting you can't be retting they can't be retting
Perfect
I can't have retted you can't have retted he can't have retted we can't have retted you can't have retted they can't have retted
V-ing perfect
I can't have been retting you can't have been retting he can't have been retting we can't have been retting you can't have been retting they can't have been retting
Interrogative form
Simple form
can I ret? can you ret? can he ret? can we ret? can you ret? can they ret?
V-ing form
can I be retting? can you be retting? can he be retting? can we be retting? can you be retting? can they be retting?
Perfect
can I have retted? can you have retted? can he have retted? can we have retted? can you have retted? can they have retted?
V-ing perfect
can I have been retting? can you have been retting? can he have been retting? can we have been retting? can you have been retting? can they have been retting?
Interro-negative form
Simple form
can't I ret? can't you ret? can't he ret? can't we ret? can't you ret? can't they ret?
V-ing form
can't I be retting? can't you be retting? can't he be retting? can't we be retting? can't you be retting? can't they be retting?
Perfect
can't I have retted? can't you have retted? can't he have retted? can't we have retted? can't you have retted? can't they have retted?
V-ing perfect
can't I have been retting? can't you have been retting? can't he have been retting? can't we have been retting? can't you have been retting? can't they have been retting?