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 cannot fret you cannot fret he cannot fret we cannot fret you cannot fret they cannot fret	I cannot be fretting you cannot be fretting he cannot be fretting we cannot be fretting you cannot be fretting they cannot be fretting
Perfect	V-ing perfect
I cannot have fretted you cannot have fretted he cannot have fretted we cannot have fretted you cannot have fretted they cannot have fretted	I cannot have been fretting you cannot have been fretting he cannot have been fretting we cannot have been fretting you cannot have been fretting they cannot 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 I not fret? can you not fret? can he not fret? can we not fret? can you not fret? can they not fret?	can I not be fretting? can you not be fretting? can he not be fretting? can we not be fretting? can you not be fretting? can they not be fretting?
Perfect	V-ing perfect
can I not have fretted? can you not have fretted? can he not have fretted? can we not have fretted? can you not have fretted? can they not have fretted?	can I not have been fretting? can you not have been fretting? can he not have been fretting? can we not have been fretting? can you not have been fretting? can they not have been fretting?