I should fail you should fail she should fail we should fail you should fail they should fail
V-ing form
I should be failing you should be failing she should be failing we should be failing you should be failing they should be failing
Perfect
I should have failed you should have failed she should have failed we should have failed you should have failed they should have failed
V-ing perfect
I should have been failing you should have been failing she should have been failing we should have been failing you should have been failing they should have been failing
Negation
Simple form
I should not fail you should not fail she should not fail we should not fail you should not fail they should not fail
V-ing form
I should not be failing you should not be failing she should not be failing we should not be failing you should not be failing they should not be failing
Perfect
I should not have failed you should not have failed she should not have failed we should not have failed you should not have failed they should not have failed
V-ing perfect
I should not have been failing you should not have been failing she should not have been failing we should not have been failing you should not have been failing they should not have been failing
Interrogative form
Simple form
should I fail? should you fail? should she fail? should we fail? should you fail? should they fail?
V-ing form
should I be failing? should you be failing? should she be failing? should we be failing? should you be failing? should they be failing?
Perfect
should I have failed? should you have failed? should she have failed? should we have failed? should you have failed? should they have failed?
V-ing perfect
should I have been failing? should you have been failing? should she have been failing? should we have been failing? should you have been failing? should they have been failing?
Interro-negative form
Simple form
should I not fail? should you not fail? should she not fail? should we not fail? should you not fail? should they not fail?
V-ing form
should I not be failing? should you not be failing? should she not be failing? should we not be failing? should you not be failing? should they not be failing?
Perfect
should I not have failed? should you not have failed? should she not have failed? should we not have failed? should you not have failed? should they not have failed?
V-ing perfect
should I not have been failing? should you not have been failing? should she not have been failing? should we not have been failing? should you not have been failing? should they not have been failing?