English verb conjugation
COULD YACKETY-YACK

Regular verb: yackety-yack - yackety-yacked - yackety-yacked

Affirmation

Simple form	V-ing form
I could yackety-yack you could yackety-yack he could yackety-yack we could yackety-yack you could yackety-yack they could yackety-yack	I could be yackety-yacking you could be yackety-yacking he could be yackety-yacking we could be yackety-yacking you could be yackety-yacking they could be yackety-yacking
Perfect	V-ing perfect
I could have yackety-yacked you could have yackety-yacked he could have yackety-yacked we could have yackety-yacked you could have yackety-yacked they could have yackety-yacked	I could have been yackety-yacking you could have been yackety-yacking he could have been yackety-yacking we could have been yackety-yacking you could have been yackety-yacking they could have been yackety-yacking

Negation

Simple form	V-ing form
I could not yackety-yack you could not yackety-yack he could not yackety-yack we could not yackety-yack you could not yackety-yack they could not yackety-yack	I could not be yackety-yacking you could not be yackety-yacking he could not be yackety-yacking we could not be yackety-yacking you could not be yackety-yacking they could not be yackety-yacking
Perfect	V-ing perfect
I could not have yackety-yacked you could not have yackety-yacked he could not have yackety-yacked we could not have yackety-yacked you could not have yackety-yacked they could not have yackety-yacked	I could not have been yackety-yacking you could not have been yackety-yacking he could not have been yackety-yacking we could not have been yackety-yacking you could not have been yackety-yacking they could not have been yackety-yacking

Interrogative form

Simple form	V-ing form
could I yackety-yack? could you yackety-yack? could he yackety-yack? could we yackety-yack? could you yackety-yack? could they yackety-yack?	could I be yackety-yacking? could you be yackety-yacking? could he be yackety-yacking? could we be yackety-yacking? could you be yackety-yacking? could they be yackety-yacking?
Perfect	V-ing perfect
could I have yackety-yacked? could you have yackety-yacked? could he have yackety-yacked? could we have yackety-yacked? could you have yackety-yacked? could they have yackety-yacked?	could I have been yackety-yacking? could you have been yackety-yacking? could he have been yackety-yacking? could we have been yackety-yacking? could you have been yackety-yacking? could they have been yackety-yacking?

Interro-negative form

Simple form	V-ing form
could I not yackety-yack? could you not yackety-yack? could he not yackety-yack? could we not yackety-yack? could you not yackety-yack? could they not yackety-yack?	could I not be yackety-yacking? could you not be yackety-yacking? could he not be yackety-yacking? could we not be yackety-yacking? could you not be yackety-yacking? could they not be yackety-yacking?
Perfect	V-ing perfect
could I not have yackety-yacked? could you not have yackety-yacked? could he not have yackety-yacked? could we not have yackety-yacked? could you not have yackety-yacked? could they not have yackety-yacked?	could I not have been yackety-yacking? could you not have been yackety-yacking? could he not have been yackety-yacking? could we not have been yackety-yacking? could you not have been yackety-yacking? could they not have been yackety-yacking?