English verb conjugation
CAN FRET

Regular verb: fret - fretted - fretted

Affirmation

Simple form	V-ing form
I can fret you can fret he can fret we can fret you can fret they can fret	I can be fretting you can be fretting he can be fretting we can be fretting you can be fretting they can be fretting
Perfect	V-ing perfect
I can have fretted you can have fretted he can have fretted we can have fretted you can have fretted they can have fretted	I can have been fretting you can have been fretting he can have been fretting we can have been fretting you can have been fretting they can have been fretting

Negation

Simple form	V-ing form
I can't fret you can't fret he can't fret we can't fret you can't fret they can't fret	I can't be fretting you can't be fretting he can't be fretting we can't be fretting you can't be fretting they can't be fretting
Perfect	V-ing perfect
I can't have fretted you can't have fretted he can't have fretted we can't have fretted you can't have fretted they can't have fretted	I can't have been fretting you can't have been fretting he can't have been fretting we can't have been fretting you can't have been fretting they can't have been fretting

Interrogative form

Simple form	V-ing form
can I fret? can you fret? can he fret? can we fret? can you fret? can they fret?	can I be fretting? can you be fretting? can he be fretting? can we be fretting? can you be fretting? can they be fretting?
Perfect	V-ing perfect
can I have fretted? can you have fretted? can he have fretted? can we have fretted? can you have fretted? can they have fretted?	can I have been fretting? can you have been fretting? can he have been fretting? can we have been fretting? can you have been fretting? can they have been fretting?

Interro-negative form

Simple form	V-ing form
can't I fret? can't you fret? can't he fret? can't we fret? can't you fret? can't they fret?	can't I be fretting? can't you be fretting? can't he be fretting? can't we be fretting? can't you be fretting? can't they be fretting?
Perfect	V-ing perfect
can't I have fretted? can't you have fretted? can't he have fretted? can't we have fretted? can't you have fretted? can't they have fretted?	can't I have been fretting? can't you have been fretting? can't he have been fretting? can't we have been fretting? can't you have been fretting? can't they have been fretting?