I should decrease you should decrease she should decrease we should decrease you should decrease they should decrease
V-ing form
I should be decreasing you should be decreasing she should be decreasing we should be decreasing you should be decreasing they should be decreasing
Perfect
I should have decreased you should have decreased she should have decreased we should have decreased you should have decreased they should have decreased
V-ing perfect
I should have been decreasing you should have been decreasing she should have been decreasing we should have been decreasing you should have been decreasing they should have been decreasing
Negation
Simple form
I should not decrease you should not decrease she should not decrease we should not decrease you should not decrease they should not decrease
V-ing form
I should not be decreasing you should not be decreasing she should not be decreasing we should not be decreasing you should not be decreasing they should not be decreasing
Perfect
I should not have decreased you should not have decreased she should not have decreased we should not have decreased you should not have decreased they should not have decreased
V-ing perfect
I should not have been decreasing you should not have been decreasing she should not have been decreasing we should not have been decreasing you should not have been decreasing they should not have been decreasing
Interrogative form
Simple form
should I decrease? should you decrease? should she decrease? should we decrease? should you decrease? should they decrease?
V-ing form
should I be decreasing? should you be decreasing? should she be decreasing? should we be decreasing? should you be decreasing? should they be decreasing?
Perfect
should I have decreased? should you have decreased? should she have decreased? should we have decreased? should you have decreased? should they have decreased?
V-ing perfect
should I have been decreasing? should you have been decreasing? should she have been decreasing? should we have been decreasing? should you have been decreasing? should they have been decreasing?
Interro-negative form
Simple form
should I not decrease? should you not decrease? should she not decrease? should we not decrease? should you not decrease? should they not decrease?
V-ing form
should I not be decreasing? should you not be decreasing? should she not be decreasing? should we not be decreasing? should you not be decreasing? should they not be decreasing?
Perfect
should I not have decreased? should you not have decreased? should she not have decreased? should we not have decreased? should you not have decreased? should they not have decreased?
V-ing perfect
should I not have been decreasing? should you not have been decreasing? should she not have been decreasing? should we not have been decreasing? should you not have been decreasing? should they not have been decreasing?