English verb conjugation
COULD VET

Regular verb: vet - vetted - vetted

Affirmation

Simple form	V-ing form
I could vet you could vet he could vet we could vet you could vet they could vet	I could be vetting you could be vetting he could be vetting we could be vetting you could be vetting they could be vetting
Perfect	V-ing perfect
I could have vetted you could have vetted he could have vetted we could have vetted you could have vetted they could have vetted	I could have been vetting you could have been vetting he could have been vetting we could have been vetting you could have been vetting they could have been vetting

Negation

Simple form	V-ing form
I couldn't vet you couldn't vet he couldn't vet we couldn't vet you couldn't vet they couldn't vet	I couldn't be vetting you couldn't be vetting he couldn't be vetting we couldn't be vetting you couldn't be vetting they couldn't be vetting
Perfect	V-ing perfect
I couldn't have vetted you couldn't have vetted he couldn't have vetted we couldn't have vetted you couldn't have vetted they couldn't have vetted	I couldn't have been vetting you couldn't have been vetting he couldn't have been vetting we couldn't have been vetting you couldn't have been vetting they couldn't have been vetting

Interrogative form

Simple form	V-ing form
could I vet? could you vet? could he vet? could we vet? could you vet? could they vet?	could I be vetting? could you be vetting? could he be vetting? could we be vetting? could you be vetting? could they be vetting?
Perfect	V-ing perfect
could I have vetted? could you have vetted? could he have vetted? could we have vetted? could you have vetted? could they have vetted?	could I have been vetting? could you have been vetting? could he have been vetting? could we have been vetting? could you have been vetting? could they have been vetting?

Interro-negative form

Simple form	V-ing form
couldn't I vet? couldn't you vet? couldn't he vet? couldn't we vet? couldn't you vet? couldn't they vet?	couldn't I be vetting? couldn't you be vetting? couldn't he be vetting? couldn't we be vetting? couldn't you be vetting? couldn't they be vetting?
Perfect	V-ing perfect
couldn't I have vetted? couldn't you have vetted? couldn't he have vetted? couldn't we have vetted? couldn't you have vetted? couldn't they have vetted?	couldn't I have been vetting? couldn't you have been vetting? couldn't he have been vetting? couldn't we have been vetting? couldn't you have been vetting? couldn't they have been vetting?