English verb conjugation
CAN HEADBUTT

Regular verb: headbutt - headbutted - headbutted

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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