must yarn
Verbo regular: yarn - yarned- yarned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must yarn
you must yarn
he must yarn
we must yarn
you must yarn
they must yarn 	I must be yarning
you must be yarning
he must be yarning
we must be yarning
you must be yarning
they must be yarning	I must have yarned
you must have yarned
he must have yarned
we must have yarned
you must have yarned
they must have yarned	I must have been yarning
you must have been yarning
he must have been yarning
we must have been yarning
you must have been yarning
they must have been yarning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't yarn
you mustn't yarn
he mustn't yarn
we mustn't yarn
you mustn't yarn
they mustn't yarn 	I mustn't be yarning
you mustn't be yarning
he mustn't be yarning
we mustn't be yarning
you mustn't be yarning
they mustn't be yarning	I mustn't have yarned
you mustn't have yarned
he mustn't have yarned
we mustn't have yarned
you mustn't have yarned
they mustn't have yarned	I mustn't have been yarning
you mustn't have been yarning
he mustn't have been yarning
we mustn't have been yarning
you mustn't have been yarning
they mustn't have been yarning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I yarn?
must you yarn?
must he yarn?
must we yarn?
must you yarn?
must they yarn? 	must I be yarning?
must you be yarning?
must he be yarning?
must we be yarning?
must you be yarning?
must they be yarning? 	must I have yarned?
must you have yarned?
must he have yarned?
must we have yarned?
must you have yarned?
must they have yarned? 	must I have been yarning?
must you have been yarning?
must he have been yarning?
must we have been yarning?
must you have been yarning?
must they have been yarning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I yarn?
mustn't you yarn?
mustn't he yarn?
mustn't we yarn?
mustn't you yarn?
mustn't they yarn? 	mustn't I be yarning?
mustn't you be yarning?
mustn't he be yarning?
mustn't we be yarning?
mustn't you be yarning?
mustn't they be yarning? 	mustn't I have yarned?
mustn't you have yarned?
mustn't he have yarned?
mustn't we have yarned?
mustn't you have yarned?
mustn't they have yarned? 	mustn't I have been yarning?
mustn't you have been yarning?
mustn't he have been yarning?
mustn't we have been yarning?
mustn't you have been yarning?
mustn't they have been yarning?