English verb conjugation
SHOULD INTERVENE

Regular verb: intervene - intervened - intervened

Affirmation

Simple form	V-ing form
I'd intervene you'd intervene she'd intervene we'd intervene you'd intervene they'd intervene	I'd be intervening you'd be intervening she'd be intervening we'd be intervening you'd be intervening they'd be intervening
Perfect	V-ing perfect
I should've intervened you should've intervened she should've intervened we should've intervened you should've intervened they should've intervened	I should've been intervening you should've been intervening she should've been intervening we should've been intervening you should've been intervening they should've been intervening

Negation

Simple form	V-ing form
I shouldn't intervene you shouldn't intervene she shouldn't intervene we shouldn't intervene you shouldn't intervene they shouldn't intervene	I shouldn't be intervening you shouldn't be intervening she shouldn't be intervening we shouldn't be intervening you shouldn't be intervening they shouldn't be intervening
Perfect	V-ing perfect
I shouldn't have intervened you shouldn't have intervened she shouldn't have intervened we shouldn't have intervened you shouldn't have intervened they shouldn't have intervened	I shouldn't have been intervening you shouldn't have been intervening she shouldn't have been intervening we shouldn't have been intervening you shouldn't have been intervening they shouldn't have been intervening

Interrogative form

Simple form	V-ing form
should I intervene? should you intervene? should she intervene? should we intervene? should you intervene? should they intervene?	should I be intervening? should you be intervening? should she be intervening? should we be intervening? should you be intervening? should they be intervening?
Perfect	V-ing perfect
should I have intervened? should you have intervened? should she have intervened? should we have intervened? should you have intervened? should they have intervened?	should I have been intervening? should you have been intervening? should she have been intervening? should we have been intervening? should you have been intervening? should they have been intervening?

Interro-negative form

Simple form	V-ing form
shouldn't I intervene? shouldn't you intervene? shouldn't she intervene? shouldn't we intervene? shouldn't you intervene? shouldn't they intervene?	shouldn't I be intervening? shouldn't you be intervening? shouldn't she be intervening? shouldn't we be intervening? shouldn't you be intervening? shouldn't they be intervening?
Perfect	V-ing perfect
shouldn't I have intervened? shouldn't you have intervened? shouldn't she have intervened? shouldn't we have intervened? shouldn't you have intervened? shouldn't they have intervened?	shouldn't I have been intervening? shouldn't you have been intervening? shouldn't she have been intervening? shouldn't we have been intervening? shouldn't you have been intervening? shouldn't they have been intervening?