English verb conjugation
SHOULD YACK

Regular verb: yack - yacked - yacked

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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