must birl
Verbo regular: birl - birled- birled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must birl
you must birl
he must birl
we must birl
you must birl
they must birl 	I must be birling
you must be birling
he must be birling
we must be birling
you must be birling
they must be birling	I must have birled
you must have birled
he must have birled
we must have birled
you must have birled
they must have birled	I must have been birling
you must have been birling
he must have been birling
we must have been birling
you must have been birling
they must have been birling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't birl
you mustn't birl
he mustn't birl
we mustn't birl
you mustn't birl
they mustn't birl 	I mustn't be birling
you mustn't be birling
he mustn't be birling
we mustn't be birling
you mustn't be birling
they mustn't be birling	I mustn't have birled
you mustn't have birled
he mustn't have birled
we mustn't have birled
you mustn't have birled
they mustn't have birled	I mustn't have been birling
you mustn't have been birling
he mustn't have been birling
we mustn't have been birling
you mustn't have been birling
they mustn't have been birling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I birl?
must you birl?
must he birl?
must we birl?
must you birl?
must they birl? 	must I be birling?
must you be birling?
must he be birling?
must we be birling?
must you be birling?
must they be birling? 	must I have birled?
must you have birled?
must he have birled?
must we have birled?
must you have birled?
must they have birled? 	must I have been birling?
must you have been birling?
must he have been birling?
must we have been birling?
must you have been birling?
must they have been birling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I birl?
mustn't you birl?
mustn't he birl?
mustn't we birl?
mustn't you birl?
mustn't they birl? 	mustn't I be birling?
mustn't you be birling?
mustn't he be birling?
mustn't we be birling?
mustn't you be birling?
mustn't they be birling? 	mustn't I have birled?
mustn't you have birled?
mustn't he have birled?
mustn't we have birled?
mustn't you have birled?
mustn't they have birled? 	mustn't I have been birling?
mustn't you have been birling?
mustn't he have been birling?
mustn't we have been birling?
mustn't you have been birling?
mustn't they have been birling?