English verb conjugation
SHOULD LACK

Regular verb: lack - lacked - lacked

Affirmation

Simple form	V-ing form
I should lack you should lack he should lack we should lack you should lack they should lack	I should be lacking you should be lacking he should be lacking we should be lacking you should be lacking they should be lacking
Perfect	V-ing perfect
I should have lacked you should have lacked he should have lacked we should have lacked you should have lacked they should have lacked	I should have been lacking you should have been lacking he should have been lacking we should have been lacking you should have been lacking they should have been lacking

Negation

Simple form	V-ing form
I should not lack you should not lack he should not lack we should not lack you should not lack they should not lack	I should not be lacking you should not be lacking he should not be lacking we should not be lacking you should not be lacking they should not be lacking
Perfect	V-ing perfect
I should not have lacked you should not have lacked he should not have lacked we should not have lacked you should not have lacked they should not have lacked	I should not have been lacking you should not have been lacking he should not have been lacking we should not have been lacking you should not have been lacking they should not have been lacking

Interrogative form

Simple form	V-ing form
should I lack? should you lack? should he lack? should we lack? should you lack? should they lack?	should I be lacking? should you be lacking? should he be lacking? should we be lacking? should you be lacking? should they be lacking?
Perfect	V-ing perfect
should I have lacked? should you have lacked? should he have lacked? should we have lacked? should you have lacked? should they have lacked?	should I have been lacking? should you have been lacking? should he have been lacking? should we have been lacking? should you have been lacking? should they have been lacking?

Interro-negative form

Simple form	V-ing form
should I not lack? should you not lack? should he not lack? should we not lack? should you not lack? should they not lack?	should I not be lacking? should you not be lacking? should he not be lacking? should we not be lacking? should you not be lacking? should they not be lacking?
Perfect	V-ing perfect
should I not have lacked? should you not have lacked? should he not have lacked? should we not have lacked? should you not have lacked? should they not have lacked?	should I not have been lacking? should you not have been lacking? should he not have been lacking? should we not have been lacking? should you not have been lacking? should they not have been lacking?