English verb conjugation
COULD TENSE

Regular verb: tense - tensed - tensed

Affirmation

Simple form	V-ing form
I could tense you could tense he could tense we could tense you could tense they could tense	I could be tensing you could be tensing he could be tensing we could be tensing you could be tensing they could be tensing
Perfect	V-ing perfect
I could have tensed you could have tensed he could have tensed we could have tensed you could have tensed they could have tensed	I could have been tensing you could have been tensing he could have been tensing we could have been tensing you could have been tensing they could have been tensing

Negation

Simple form	V-ing form
I could not tense you could not tense he could not tense we could not tense you could not tense they could not tense	I could not be tensing you could not be tensing he could not be tensing we could not be tensing you could not be tensing they could not be tensing
Perfect	V-ing perfect
I could not have tensed you could not have tensed he could not have tensed we could not have tensed you could not have tensed they could not have tensed	I could not have been tensing you could not have been tensing he could not have been tensing we could not have been tensing you could not have been tensing they could not have been tensing

Interrogative form

Simple form	V-ing form
could I tense? could you tense? could he tense? could we tense? could you tense? could they tense?	could I be tensing? could you be tensing? could he be tensing? could we be tensing? could you be tensing? could they be tensing?
Perfect	V-ing perfect
could I have tensed? could you have tensed? could he have tensed? could we have tensed? could you have tensed? could they have tensed?	could I have been tensing? could you have been tensing? could he have been tensing? could we have been tensing? could you have been tensing? could they have been tensing?

Interro-negative form

Simple form	V-ing form
could I not tense? could you not tense? could he not tense? could we not tense? could you not tense? could they not tense?	could I not be tensing? could you not be tensing? could he not be tensing? could we not be tensing? could you not be tensing? could they not be tensing?
Perfect	V-ing perfect
could I not have tensed? could you not have tensed? could he not have tensed? could we not have tensed? could you not have tensed? could they not have tensed?	could I not have been tensing? could you not have been tensing? could he not have been tensing? could we not have been tensing? could you not have been tensing? could they not have been tensing?