English verb conjugation
SHOULD HEADBUTT

Regular verb: headbutt - headbutted - headbutted

Affirmation

Simple form	V-ing form
I'd headbutt you'd headbutt he'd headbutt we'd headbutt you'd headbutt they'd headbutt	I'd be headbutting you'd be headbutting he'd be headbutting we'd be headbutting you'd be headbutting they'd be headbutting
Perfect	V-ing perfect
I should've headbutted you should've headbutted he should've headbutted we should've headbutted you should've headbutted they should've headbutted	I should've been headbutting you should've been headbutting he should've been headbutting we should've been headbutting you should've been headbutting they should've been headbutting

Negation

Simple form	V-ing form
I shouldn't headbutt you shouldn't headbutt he shouldn't headbutt we shouldn't headbutt you shouldn't headbutt they shouldn't headbutt	I shouldn't be headbutting you shouldn't be headbutting he shouldn't be headbutting we shouldn't be headbutting you shouldn't be headbutting they shouldn't be headbutting
Perfect	V-ing perfect
I shouldn't have headbutted you shouldn't have headbutted he shouldn't have headbutted we shouldn't have headbutted you shouldn't have headbutted they shouldn't have headbutted	I shouldn't have been headbutting you shouldn't have been headbutting he shouldn't have been headbutting we shouldn't have been headbutting you shouldn't have been headbutting they shouldn't have been headbutting

Interrogative form

Simple form	V-ing form
should I headbutt? should you headbutt? should he headbutt? should we headbutt? should you headbutt? should they headbutt?	should I be headbutting? should you be headbutting? should he be headbutting? should we be headbutting? should you be headbutting? should they be headbutting?
Perfect	V-ing perfect
should I have headbutted? should you have headbutted? should he have headbutted? should we have headbutted? should you have headbutted? should they have headbutted?	should I have been headbutting? should you have been headbutting? should he have been headbutting? should we have been headbutting? should you have been headbutting? should they have been headbutting?

Interro-negative form

Simple form	V-ing form
shouldn't I headbutt? shouldn't you headbutt? shouldn't he headbutt? shouldn't we headbutt? shouldn't you headbutt? shouldn't they headbutt?	shouldn't I be headbutting? shouldn't you be headbutting? shouldn't he be headbutting? shouldn't we be headbutting? shouldn't you be headbutting? shouldn't they be headbutting?
Perfect	V-ing perfect
shouldn't I have headbutted? shouldn't you have headbutted? shouldn't he have headbutted? shouldn't we have headbutted? shouldn't you have headbutted? shouldn't they have headbutted?	shouldn't I have been headbutting? shouldn't you have been headbutting? shouldn't he have been headbutting? shouldn't we have been headbutting? shouldn't you have been headbutting? shouldn't they have been headbutting?