English verb conjugation
COULD VOW

Regular verb: vow - vowed - vowed

Affirmation

Simple form	V-ing form
I could vow you could vow she could vow we could vow you could vow they could vow	I could be vowing you could be vowing she 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 she 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 she 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 couldn't vow you couldn't vow she couldn't vow we couldn't vow you couldn't vow they couldn't vow	I couldn't be vowing you couldn't be vowing she couldn't be vowing we couldn't be vowing you couldn't be vowing they couldn't be vowing
Perfect	V-ing perfect
I couldn't have vowed you couldn't have vowed she couldn't have vowed we couldn't have vowed you couldn't have vowed they couldn't have vowed	I couldn't have been vowing you couldn't have been vowing she couldn't have been vowing we couldn't have been vowing you couldn't have been vowing they couldn't have been vowing

Interrogative form

Simple form	V-ing form
could I vow? could you vow? could she vow? could we vow? could you vow? could they vow?	could I be vowing? could you be vowing? could she 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 she 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 she 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
couldn't I vow? couldn't you vow? couldn't she vow? couldn't we vow? couldn't you vow? couldn't they vow?	couldn't I be vowing? couldn't you be vowing? couldn't she be vowing? couldn't we be vowing? couldn't you be vowing? couldn't they be vowing?
Perfect	V-ing perfect
couldn't I have vowed? couldn't you have vowed? couldn't she have vowed? couldn't we have vowed? couldn't you have vowed? couldn't they have vowed?	couldn't I have been vowing? couldn't you have been vowing? couldn't she have been vowing? couldn't we have been vowing? couldn't you have been vowing? couldn't they have been vowing?