Conjugación del verbo inglés
COULD FRET

Verbo regular: fret - fretted - fretted

Afirmación

Forma simple	Forma con V-ing
I could fret you could fret he could fret we could fret you could fret they could fret	I could be fretting you could be fretting he could be fretting we could be fretting you could be fretting they could be fretting
Perfecto	Perfecto con V-ing
I could have fretted you could have fretted he could have fretted we could have fretted you could have fretted they could have fretted	I could have been fretting you could have been fretting he could have been fretting we could have been fretting you could have been fretting they could have been fretting

Negación

Forma simple	Forma con V-ing
I could not fret you could not fret he could not fret we could not fret you could not fret they could not fret	I could not be fretting you could not be fretting he could not be fretting we could not be fretting you could not be fretting they could not be fretting
Perfecto	Perfecto con V-ing
I could not have fretted you could not have fretted he could not have fretted we could not have fretted you could not have fretted they could not have fretted	I could not have been fretting you could not have been fretting he could not have been fretting we could not have been fretting you could not have been fretting they could not have been fretting

Forma interrogativa

Forma simple	Forma con V-ing
could I fret? could you fret? could he fret? could we fret? could you fret? could they fret?	could I be fretting? could you be fretting? could he be fretting? could we be fretting? could you be fretting? could they be fretting?
Perfecto	Perfecto con V-ing
could I have fretted? could you have fretted? could he have fretted? could we have fretted? could you have fretted? could they have fretted?	could I have been fretting? could you have been fretting? could he have been fretting? could we have been fretting? could you have been fretting? could they have been fretting?

Forma interro-negativa

Forma simple	Forma con V-ing
could I not fret? could you not fret? could he not fret? could we not fret? could you not fret? could they not fret?	could I not be fretting? could you not be fretting? could he not be fretting? could we not be fretting? could you not be fretting? could they not be fretting?
Perfecto	Perfecto con V-ing
could I not have fretted? could you not have fretted? could he not have fretted? could we not have fretted? could you not have fretted? could they not have fretted?	could I not have been fretting? could you not have been fretting? could he not have been fretting? could we not have been fretting? could you not have been fretting? could they not have been fretting?