must headbutt
Verbo regular: headbutt - headbutted- headbutted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must headbutt
you must headbutt
he must headbutt
we must headbutt
you must headbutt
they must headbutt 	I must be headbutting
you must be headbutting
he must be headbutting
we must be headbutting
you must be headbutting
they must be headbutting	I must have headbutted
you must have headbutted
he must have headbutted
we must have headbutted
you must have headbutted
they must have headbutted	I must have been headbutting
you must have been headbutting
he must have been headbutting
we must have been headbutting
you must have been headbutting
they must have been headbutting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't headbutt
you mustn't headbutt
he mustn't headbutt
we mustn't headbutt
you mustn't headbutt
they mustn't headbutt 	I mustn't be headbutting
you mustn't be headbutting
he mustn't be headbutting
we mustn't be headbutting
you mustn't be headbutting
they mustn't be headbutting	I mustn't have headbutted
you mustn't have headbutted
he mustn't have headbutted
we mustn't have headbutted
you mustn't have headbutted
they mustn't have headbutted	I mustn't have been headbutting
you mustn't have been headbutting
he mustn't have been headbutting
we mustn't have been headbutting
you mustn't have been headbutting
they mustn't have been headbutting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I headbutt?
must you headbutt?
must he headbutt?
must we headbutt?
must you headbutt?
must they headbutt? 	must I be headbutting?
must you be headbutting?
must he be headbutting?
must we be headbutting?
must you be headbutting?
must they be headbutting? 	must I have headbutted?
must you have headbutted?
must he have headbutted?
must we have headbutted?
must you have headbutted?
must they have headbutted? 	must I have been headbutting?
must you have been headbutting?
must he have been headbutting?
must we have been headbutting?
must you have been headbutting?
must they have been headbutting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I headbutt?
mustn't you headbutt?
mustn't he headbutt?
mustn't we headbutt?
mustn't you headbutt?
mustn't they headbutt? 	mustn't I be headbutting?
mustn't you be headbutting?
mustn't he be headbutting?
mustn't we be headbutting?
mustn't you be headbutting?
mustn't they be headbutting? 	mustn't I have headbutted?
mustn't you have headbutted?
mustn't he have headbutted?
mustn't we have headbutted?
mustn't you have headbutted?
mustn't they have headbutted? 	mustn't I have been headbutting?
mustn't you have been headbutting?
mustn't he have been headbutting?
mustn't we have been headbutting?
mustn't you have been headbutting?
mustn't they have been headbutting?