English verb conjugation COULD YACK

Regular verb: yack - yacked - yacked

Affirmation

Simple form

I could yack
you could yack
he could yack
we could yack
you could yack
they could yack

V-ing form

I could be yacking
you could be yacking
he could be yacking
we could be yacking
you could be yacking
they could be yacking

Perfect

I could have yacked
you could have yacked
he could have yacked
we could have yacked
you could have yacked
they could have yacked

V-ing perfect

I could have been yacking
you could have been yacking
he could have been yacking
we could have been yacking
you could have been yacking
they could have been yacking

Negation

Simple form

I could not yack
you could not yack
he could not yack
we could not yack
you could not yack
they could not yack

V-ing form

I could not be yacking
you could not be yacking
he could not be yacking
we could not be yacking
you could not be yacking
they could not be yacking

Perfect

I could not have yacked
you could not have yacked
he could not have yacked
we could not have yacked
you could not have yacked
they could not have yacked

V-ing perfect

I could not have been yacking
you could not have been yacking
he could not have been yacking
we could not have been yacking
you could not have been yacking
they could not have been yacking

Interrogative form

Simple form

could I yack?
could you yack?
could he yack?
could we yack?
could you yack?
could they yack?

V-ing form

could I be yacking?
could you be yacking?
could he be yacking?
could we be yacking?
could you be yacking?
could they be yacking?

Perfect

could I have yacked?
could you have yacked?
could he have yacked?
could we have yacked?
could you have yacked?
could they have yacked?

V-ing perfect

could I have been yacking?
could you have been yacking?
could he have been yacking?
could we have been yacking?
could you have been yacking?
could they have been yacking?

Interro-negative form

Simple form

could I not yack?
could you not yack?
could he not yack?
could we not yack?
could you not yack?
could they not yack?

V-ing form

could I not be yacking?
could you not be yacking?
could he not be yacking?
could we not be yacking?
could you not be yacking?
could they not be yacking?

Perfect

could I not have yacked?
could you not have yacked?
could he not have yacked?
could we not have yacked?
could you not have yacked?
could they not have yacked?

V-ing perfect

could I not have been yacking?
could you not have been yacking?
could he not have been yacking?
could we not have been yacking?
could you not have been yacking?
could they not have been yacking?

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