I should sag you should sag he should sag we should sag you should sag they should sag
V-ing form
I should be sagging you should be sagging he should be sagging we should be sagging you should be sagging they should be sagging
Perfect
I should have sagged you should have sagged he should have sagged we should have sagged you should have sagged they should have sagged
V-ing perfect
I should have been sagging you should have been sagging he should have been sagging we should have been sagging you should have been sagging they should have been sagging
Negation
Simple form
I should not sag you should not sag he should not sag we should not sag you should not sag they should not sag
V-ing form
I should not be sagging you should not be sagging he should not be sagging we should not be sagging you should not be sagging they should not be sagging
Perfect
I should not have sagged you should not have sagged he should not have sagged we should not have sagged you should not have sagged they should not have sagged
V-ing perfect
I should not have been sagging you should not have been sagging he should not have been sagging we should not have been sagging you should not have been sagging they should not have been sagging
Interrogative form
Simple form
should I sag? should you sag? should he sag? should we sag? should you sag? should they sag?
V-ing form
should I be sagging? should you be sagging? should he be sagging? should we be sagging? should you be sagging? should they be sagging?
Perfect
should I have sagged? should you have sagged? should he have sagged? should we have sagged? should you have sagged? should they have sagged?
V-ing perfect
should I have been sagging? should you have been sagging? should he have been sagging? should we have been sagging? should you have been sagging? should they have been sagging?
Interro-negative form
Simple form
should I not sag? should you not sag? should he not sag? should we not sag? should you not sag? should they not sag?
V-ing form
should I not be sagging? should you not be sagging? should he not be sagging? should we not be sagging? should you not be sagging? should they not be sagging?
Perfect
should I not have sagged? should you not have sagged? should he not have sagged? should we not have sagged? should you not have sagged? should they not have sagged?
V-ing perfect
should I not have been sagging? should you not have been sagging? should he not have been sagging? should we not have been sagging? should you not have been sagging? should they not have been sagging?