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 couldn't diet you couldn't diet he couldn't diet we couldn't diet you couldn't diet they couldn't diet	I couldn't be dieting you couldn't be dieting he couldn't be dieting we couldn't be dieting you couldn't be dieting they couldn't be dieting
Perfect	V-ing perfect
I couldn't have dieted you couldn't have dieted he couldn't have dieted we couldn't have dieted you couldn't have dieted they couldn't have dieted	I couldn't have been dieting you couldn't have been dieting he couldn't have been dieting we couldn't have been dieting you couldn't have been dieting they couldn't 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
couldn't I diet? couldn't you diet? couldn't he diet? couldn't we diet? couldn't you diet? couldn't they diet?	couldn't I be dieting? couldn't you be dieting? couldn't he be dieting? couldn't we be dieting? couldn't you be dieting? couldn't they be dieting?
Perfect	V-ing perfect
couldn't I have dieted? couldn't you have dieted? couldn't he have dieted? couldn't we have dieted? couldn't you have dieted? couldn't they have dieted?	couldn't I have been dieting? couldn't you have been dieting? couldn't he have been dieting? couldn't we have been dieting? couldn't you have been dieting? couldn't they have been dieting?