I should crack you should crack he should crack we should crack you should crack they should crack
V-ing form
I should be cracking you should be cracking he should be cracking we should be cracking you should be cracking they should be cracking
Perfect
I should have cracked you should have cracked he should have cracked we should have cracked you should have cracked they should have cracked
V-ing perfect
I should have been cracking you should have been cracking he should have been cracking we should have been cracking you should have been cracking they should have been cracking
Negation
Simple form
I should not crack you should not crack he should not crack we should not crack you should not crack they should not crack
V-ing form
I should not be cracking you should not be cracking he should not be cracking we should not be cracking you should not be cracking they should not be cracking
Perfect
I should not have cracked you should not have cracked he should not have cracked we should not have cracked you should not have cracked they should not have cracked
V-ing perfect
I should not have been cracking you should not have been cracking he should not have been cracking we should not have been cracking you should not have been cracking they should not have been cracking
Interrogative form
Simple form
should I crack? should you crack? should he crack? should we crack? should you crack? should they crack?
V-ing form
should I be cracking? should you be cracking? should he be cracking? should we be cracking? should you be cracking? should they be cracking?
Perfect
should I have cracked? should you have cracked? should he have cracked? should we have cracked? should you have cracked? should they have cracked?
V-ing perfect
should I have been cracking? should you have been cracking? should he have been cracking? should we have been cracking? should you have been cracking? should they have been cracking?
Interro-negative form
Simple form
should I not crack? should you not crack? should he not crack? should we not crack? should you not crack? should they not crack?
V-ing form
should I not be cracking? should you not be cracking? should he not be cracking? should we not be cracking? should you not be cracking? should they not be cracking?
Perfect
should I not have cracked? should you not have cracked? should he not have cracked? should we not have cracked? should you not have cracked? should they not have cracked?
V-ing perfect
should I not have been cracking? should you not have been cracking? should he not have been cracking? should we not have been cracking? should you not have been cracking? should they not have been cracking?