I should mar you should mar he should mar we should mar you should mar they should mar
V-ing form
I should be marring you should be marring he should be marring we should be marring you should be marring they should be marring
Perfect
I should have marred you should have marred he should have marred we should have marred you should have marred they should have marred
V-ing perfect
I should have been marring you should have been marring he should have been marring we should have been marring you should have been marring they should have been marring
Negation
Simple form
I should not mar you should not mar he should not mar we should not mar you should not mar they should not mar
V-ing form
I should not be marring you should not be marring he should not be marring we should not be marring you should not be marring they should not be marring
Perfect
I should not have marred you should not have marred he should not have marred we should not have marred you should not have marred they should not have marred
V-ing perfect
I should not have been marring you should not have been marring he should not have been marring we should not have been marring you should not have been marring they should not have been marring
Interrogative form
Simple form
should I mar? should you mar? should he mar? should we mar? should you mar? should they mar?
V-ing form
should I be marring? should you be marring? should he be marring? should we be marring? should you be marring? should they be marring?
Perfect
should I have marred? should you have marred? should he have marred? should we have marred? should you have marred? should they have marred?
V-ing perfect
should I have been marring? should you have been marring? should he have been marring? should we have been marring? should you have been marring? should they have been marring?
Interro-negative form
Simple form
should I not mar? should you not mar? should he not mar? should we not mar? should you not mar? should they not mar?
V-ing form
should I not be marring? should you not be marring? should he not be marring? should we not be marring? should you not be marring? should they not be marring?
Perfect
should I not have marred? should you not have marred? should he not have marred? should we not have marred? should you not have marred? should they not have marred?
V-ing perfect
should I not have been marring? should you not have been marring? should he not have been marring? should we not have been marring? should you not have been marring? should they not have been marring?