I can ret you can ret she can ret we can ret you can ret they can ret
V-ing form
I can be retting you can be retting she can be retting we can be retting you can be retting they can be retting
Perfect
I can have retted you can have retted she 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 she 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 she 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 she 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 she 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 she 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 she ret? can we ret? can you ret? can they ret?
V-ing form
can I be retting? can you be retting? can she be retting? can we be retting? can you be retting? can they be retting?
Perfect
can I have retted? can you have retted? can she 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 she 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 she 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 she 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 she 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 she have been retting? can't we have been retting? can't you have been retting? can't they have been retting?