I should change you should change he should change we should change you should change they should change
V-ing form
I should be changing you should be changing he should be changing we should be changing you should be changing they should be changing
Perfect
I should have changed you should have changed he should have changed we should have changed you should have changed they should have changed
V-ing perfect
I should have been changing you should have been changing he should have been changing we should have been changing you should have been changing they should have been changing
Negation
Simple form
I should not change you should not change he should not change we should not change you should not change they should not change
V-ing form
I should not be changing you should not be changing he should not be changing we should not be changing you should not be changing they should not be changing
Perfect
I should not have changed you should not have changed he should not have changed we should not have changed you should not have changed they should not have changed
V-ing perfect
I should not have been changing you should not have been changing he should not have been changing we should not have been changing you should not have been changing they should not have been changing
Interrogative form
Simple form
should I change? should you change? should he change? should we change? should you change? should they change?
V-ing form
should I be changing? should you be changing? should he be changing? should we be changing? should you be changing? should they be changing?
Perfect
should I have changed? should you have changed? should he have changed? should we have changed? should you have changed? should they have changed?
V-ing perfect
should I have been changing? should you have been changing? should he have been changing? should we have been changing? should you have been changing? should they have been changing?
Interro-negative form
Simple form
should I not change? should you not change? should he not change? should we not change? should you not change? should they not change?
V-ing form
should I not be changing? should you not be changing? should he not be changing? should we not be changing? should you not be changing? should they not be changing?
Perfect
should I not have changed? should you not have changed? should he not have changed? should we not have changed? should you not have changed? should they not have changed?
V-ing perfect
should I not have been changing? should you not have been changing? should he not have been changing? should we not have been changing? should you not have been changing? should they not have been changing?