English verb conjugation
SHOULD CHANGE

Regular verb: change - changed - changed

Affirmation

Simple form	V-ing form
I'd change you'd change he'd change we'd change you'd change they'd change	I'd be changing you'd be changing he'd be changing we'd be changing you'd be changing they'd be changing
Perfect	V-ing perfect
I should've changed you should've changed he should've changed we should've changed you should've changed they should've changed	I should've been changing you should've been changing he should've been changing we should've been changing you should've been changing they should've been changing

Negation

Simple form	V-ing form
I shouldn't change you shouldn't change he shouldn't change we shouldn't change you shouldn't change they shouldn't change	I shouldn't be changing you shouldn't be changing he shouldn't be changing we shouldn't be changing you shouldn't be changing they shouldn't be changing
Perfect	V-ing perfect
I shouldn't have changed you shouldn't have changed he shouldn't have changed we shouldn't have changed you shouldn't have changed they shouldn't have changed	I shouldn't have been changing you shouldn't have been changing he shouldn't have been changing we shouldn't have been changing you shouldn't have been changing they shouldn't have been changing

Interrogative form

Simple form	V-ing form
should I change? should you change? should he change? should we change? should you change? should they change?	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	V-ing 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?	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	V-ing form
shouldn't I change? shouldn't you change? shouldn't he change? shouldn't we change? shouldn't you change? shouldn't they change?	shouldn't I be changing? shouldn't you be changing? shouldn't he be changing? shouldn't we be changing? shouldn't you be changing? shouldn't they be changing?
Perfect	V-ing perfect
shouldn't I have changed? shouldn't you have changed? shouldn't he have changed? shouldn't we have changed? shouldn't you have changed? shouldn't they have changed?	shouldn't I have been changing? shouldn't you have been changing? shouldn't he have been changing? shouldn't we have been changing? shouldn't you have been changing? shouldn't they have been changing?