English verb conjugation
CAN RET

Regular verb: ret - retted - retted

Affirmation

Simple form	V-ing form
I can ret you can ret he can ret we can ret you can ret they can ret	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
can I ret? can you ret? can he ret? can we ret? can you ret? can they ret?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?