English verb conjugation
COULD UTTER

Regular verb: utter - uttered - uttered

Affirmation

Simple form	V-ing form
I could utter you could utter he could utter we could utter you could utter they could utter	I could be uttering you could be uttering he could be uttering we could be uttering you could be uttering they could be uttering
Perfect	V-ing perfect
I could have uttered you could have uttered he could have uttered we could have uttered you could have uttered they could have uttered	I could have been uttering you could have been uttering he could have been uttering we could have been uttering you could have been uttering they could have been uttering

Negation

Simple form	V-ing form
I could not utter you could not utter he could not utter we could not utter you could not utter they could not utter	I could not be uttering you could not be uttering he could not be uttering we could not be uttering you could not be uttering they could not be uttering
Perfect	V-ing perfect
I could not have uttered you could not have uttered he could not have uttered we could not have uttered you could not have uttered they could not have uttered	I could not have been uttering you could not have been uttering he could not have been uttering we could not have been uttering you could not have been uttering they could not have been uttering

Interrogative form

Simple form	V-ing form
could I utter? could you utter? could he utter? could we utter? could you utter? could they utter?	could I be uttering? could you be uttering? could he be uttering? could we be uttering? could you be uttering? could they be uttering?
Perfect	V-ing perfect
could I have uttered? could you have uttered? could he have uttered? could we have uttered? could you have uttered? could they have uttered?	could I have been uttering? could you have been uttering? could he have been uttering? could we have been uttering? could you have been uttering? could they have been uttering?

Interro-negative form

Simple form	V-ing form
could I not utter? could you not utter? could he not utter? could we not utter? could you not utter? could they not utter?	could I not be uttering? could you not be uttering? could he not be uttering? could we not be uttering? could you not be uttering? could they not be uttering?
Perfect	V-ing perfect
could I not have uttered? could you not have uttered? could he not have uttered? could we not have uttered? could you not have uttered? could they not have uttered?	could I not have been uttering? could you not have been uttering? could he not have been uttering? could we not have been uttering? could you not have been uttering? could they not have been uttering?