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 could not stet you could not stet he could not stet we could not stet you could not stet they could not stet	I could not be stetting you could not be stetting he could not be stetting we could not be stetting you could not be stetting they could not be stetting
Perfect	V-ing perfect
I could not have stetted you could not have stetted he could not have stetted we could not have stetted you could not have stetted they could not have stetted	I could not have been stetting you could not have been stetting he could not have been stetting we could not have been stetting you could not have been stetting they could not 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
could I not stet? could you not stet? could he not stet? could we not stet? could you not stet? could they not stet?	could I not be stetting? could you not be stetting? could he not be stetting? could we not be stetting? could you not be stetting? could they not be stetting?
Perfect	V-ing perfect
could I not have stetted? could you not have stetted? could he not have stetted? could we not have stetted? could you not have stetted? could they not have stetted?	could I not have been stetting? could you not have been stetting? could he not have been stetting? could we not have been stetting? could you not have been stetting? could they not have been stetting?