English verb conjugation
COULD STET

Regular verb: stet - stetted - stetted

Affirmation

Simple form	V-ing form
I could stet you could stet he could stet we could stet you could stet they could stet	I could be stetting you could be stetting he could be stetting we could be stetting you could be stetting they could be stetting
Perfect	V-ing perfect
I could have stetted you could have stetted he could have stetted we could have stetted you could have stetted they could have stetted	I could have been stetting you could have been stetting he could have been stetting we could have been stetting you could have been stetting they could have been stetting

Negation

Simple form	V-ing form
I couldn't stet you couldn't stet he couldn't stet we couldn't stet you couldn't stet they couldn't stet	I couldn't be stetting you couldn't be stetting he couldn't be stetting we couldn't be stetting you couldn't be stetting they couldn't be stetting
Perfect	V-ing perfect
I couldn't have stetted you couldn't have stetted he couldn't have stetted we couldn't have stetted you couldn't have stetted they couldn't have stetted	I couldn't have been stetting you couldn't have been stetting he couldn't have been stetting we couldn't have been stetting you couldn't have been stetting they couldn't have been stetting

Interrogative form

Simple form	V-ing form
could I stet? could you stet? could he stet? could we stet? could you stet? could they stet?	could I be stetting? could you be stetting? could he be stetting? could we be stetting? could you be stetting? could they be stetting?
Perfect	V-ing perfect
could I have stetted? could you have stetted? could he have stetted? could we have stetted? could you have stetted? could they have stetted?	could I have been stetting? could you have been stetting? could he have been stetting? could we have been stetting? could you have been stetting? could they have been stetting?

Interro-negative form

Simple form	V-ing form
couldn't I stet? couldn't you stet? couldn't he stet? couldn't we stet? couldn't you stet? couldn't they stet?	couldn't I be stetting? couldn't you be stetting? couldn't he be stetting? couldn't we be stetting? couldn't you be stetting? couldn't they be stetting?
Perfect	V-ing perfect
couldn't I have stetted? couldn't you have stetted? couldn't he have stetted? couldn't we have stetted? couldn't you have stetted? couldn't they have stetted?	couldn't I have been stetting? couldn't you have been stetting? couldn't he have been stetting? couldn't we have been stetting? couldn't you have been stetting? couldn't they have been stetting?