English verb conjugation
COULD DIET

Regular verb: diet - dieted - dieted

Affirmation

Simple form	V-ing form
I could diet you could diet he could diet we could diet you could diet they could diet	I could be dieting you could be dieting he could be dieting we could be dieting you could be dieting they could be dieting
Perfect	V-ing perfect
I could have dieted you could have dieted he could have dieted we could have dieted you could have dieted they could have dieted	I could have been dieting you could have been dieting he could have been dieting we could have been dieting you could have been dieting they could have been dieting

Negation

Simple form	V-ing form
I could not diet you could not diet he could not diet we could not diet you could not diet they could not diet	I could not be dieting you could not be dieting he could not be dieting we could not be dieting you could not be dieting they could not be dieting
Perfect	V-ing perfect
I could not have dieted you could not have dieted he could not have dieted we could not have dieted you could not have dieted they could not have dieted	I could not have been dieting you could not have been dieting he could not have been dieting we could not have been dieting you could not have been dieting they could not have been dieting

Interrogative form

Simple form	V-ing form
could I diet? could you diet? could he diet? could we diet? could you diet? could they diet?	could I be dieting? could you be dieting? could he be dieting? could we be dieting? could you be dieting? could they be dieting?
Perfect	V-ing perfect
could I have dieted? could you have dieted? could he have dieted? could we have dieted? could you have dieted? could they have dieted?	could I have been dieting? could you have been dieting? could he have been dieting? could we have been dieting? could you have been dieting? could they have been dieting?

Interro-negative form

Simple form	V-ing form
could I not diet? could you not diet? could he not diet? could we not diet? could you not diet? could they not diet?	could I not be dieting? could you not be dieting? could he not be dieting? could we not be dieting? could you not be dieting? could they not be dieting?
Perfect	V-ing perfect
could I not have dieted? could you not have dieted? could he not have dieted? could we not have dieted? could you not have dieted? could they not have dieted?	could I not have been dieting? could you not have been dieting? could he not have been dieting? could we not have been dieting? could you not have been dieting? could they not have been dieting?