English verb conjugation
COULD VETO

Regular verb: veto - vetoed - vetoed

Affirmation

Simple form	V-ing form
I could veto you could veto he could veto we could veto you could veto they could veto	I could be vetoing you could be vetoing he could be vetoing we could be vetoing you could be vetoing they could be vetoing
Perfect	V-ing perfect
I could have vetoed you could have vetoed he could have vetoed we could have vetoed you could have vetoed they could have vetoed	I could have been vetoing you could have been vetoing he could have been vetoing we could have been vetoing you could have been vetoing they could have been vetoing

Negation

Simple form	V-ing form
I couldn't veto you couldn't veto he couldn't veto we couldn't veto you couldn't veto they couldn't veto	I couldn't be vetoing you couldn't be vetoing he couldn't be vetoing we couldn't be vetoing you couldn't be vetoing they couldn't be vetoing
Perfect	V-ing perfect
I couldn't have vetoed you couldn't have vetoed he couldn't have vetoed we couldn't have vetoed you couldn't have vetoed they couldn't have vetoed	I couldn't have been vetoing you couldn't have been vetoing he couldn't have been vetoing we couldn't have been vetoing you couldn't have been vetoing they couldn't have been vetoing

Interrogative form

Simple form	V-ing form
could I veto? could you veto? could he veto? could we veto? could you veto? could they veto?	could I be vetoing? could you be vetoing? could he be vetoing? could we be vetoing? could you be vetoing? could they be vetoing?
Perfect	V-ing perfect
could I have vetoed? could you have vetoed? could he have vetoed? could we have vetoed? could you have vetoed? could they have vetoed?	could I have been vetoing? could you have been vetoing? could he have been vetoing? could we have been vetoing? could you have been vetoing? could they have been vetoing?

Interro-negative form

Simple form	V-ing form
couldn't I veto? couldn't you veto? couldn't he veto? couldn't we veto? couldn't you veto? couldn't they veto?	couldn't I be vetoing? couldn't you be vetoing? couldn't he be vetoing? couldn't we be vetoing? couldn't you be vetoing? couldn't they be vetoing?
Perfect	V-ing perfect
couldn't I have vetoed? couldn't you have vetoed? couldn't he have vetoed? couldn't we have vetoed? couldn't you have vetoed? couldn't they have vetoed?	couldn't I have been vetoing? couldn't you have been vetoing? couldn't he have been vetoing? couldn't we have been vetoing? couldn't you have been vetoing? couldn't they have been vetoing?