I should gain you should gain he should gain we should gain you should gain they should gain
V-ing form
I should be gaining you should be gaining he should be gaining we should be gaining you should be gaining they should be gaining
Perfect
I should have gained you should have gained he should have gained we should have gained you should have gained they should have gained
V-ing perfect
I should have been gaining you should have been gaining he should have been gaining we should have been gaining you should have been gaining they should have been gaining
Negation
Simple form
I should not gain you should not gain he should not gain we should not gain you should not gain they should not gain
V-ing form
I should not be gaining you should not be gaining he should not be gaining we should not be gaining you should not be gaining they should not be gaining
Perfect
I should not have gained you should not have gained he should not have gained we should not have gained you should not have gained they should not have gained
V-ing perfect
I should not have been gaining you should not have been gaining he should not have been gaining we should not have been gaining you should not have been gaining they should not have been gaining
Interrogative form
Simple form
should I gain? should you gain? should he gain? should we gain? should you gain? should they gain?
V-ing form
should I be gaining? should you be gaining? should he be gaining? should we be gaining? should you be gaining? should they be gaining?
Perfect
should I have gained? should you have gained? should he have gained? should we have gained? should you have gained? should they have gained?
V-ing perfect
should I have been gaining? should you have been gaining? should he have been gaining? should we have been gaining? should you have been gaining? should they have been gaining?
Interro-negative form
Simple form
should I not gain? should you not gain? should he not gain? should we not gain? should you not gain? should they not gain?
V-ing form
should I not be gaining? should you not be gaining? should he not be gaining? should we not be gaining? should you not be gaining? should they not be gaining?
Perfect
should I not have gained? should you not have gained? should he not have gained? should we not have gained? should you not have gained? should they not have gained?
V-ing perfect
should I not have been gaining? should you not have been gaining? should he not have been gaining? should we not have been gaining? should you not have been gaining? should they not have been gaining?