English verb conjugation
COULD VOW

Regular verb: vow - vowed - vowed

Affirmation

Simple form	V-ing form
I could vow you could vow he could vow we could vow you could vow they could vow	I could be vowing you could be vowing he could be vowing we could be vowing you could be vowing they could be vowing
Perfect	V-ing perfect
I could have vowed you could have vowed he could have vowed we could have vowed you could have vowed they could have vowed	I could have been vowing you could have been vowing he could have been vowing we could have been vowing you could have been vowing they could have been vowing

Negation

Simple form	V-ing form
I could not vow you could not vow he could not vow we could not vow you could not vow they could not vow	I could not be vowing you could not be vowing he could not be vowing we could not be vowing you could not be vowing they could not be vowing
Perfect	V-ing perfect
I could not have vowed you could not have vowed he could not have vowed we could not have vowed you could not have vowed they could not have vowed	I could not have been vowing you could not have been vowing he could not have been vowing we could not have been vowing you could not have been vowing they could not have been vowing

Interrogative form

Simple form	V-ing form
could I vow? could you vow? could he vow? could we vow? could you vow? could they vow?	could I be vowing? could you be vowing? could he be vowing? could we be vowing? could you be vowing? could they be vowing?
Perfect	V-ing perfect
could I have vowed? could you have vowed? could he have vowed? could we have vowed? could you have vowed? could they have vowed?	could I have been vowing? could you have been vowing? could he have been vowing? could we have been vowing? could you have been vowing? could they have been vowing?

Interro-negative form

Simple form	V-ing form
could I not vow? could you not vow? could he not vow? could we not vow? could you not vow? could they not vow?	could I not be vowing? could you not be vowing? could he not be vowing? could we not be vowing? could you not be vowing? could they not be vowing?
Perfect	V-ing perfect
could I not have vowed? could you not have vowed? could he not have vowed? could we not have vowed? could you not have vowed? could they not have vowed?	could I not have been vowing? could you not have been vowing? could he not have been vowing? could we not have been vowing? could you not have been vowing? could they not have been vowing?