must preen
Verbo regular: preen - preened- preened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must preen
you must preen
he must preen
we must preen
you must preen
they must preen 	I must be preening
you must be preening
he must be preening
we must be preening
you must be preening
they must be preening	I must have preened
you must have preened
he must have preened
we must have preened
you must have preened
they must have preened	I must have been preening
you must have been preening
he must have been preening
we must have been preening
you must have been preening
they must have been preening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't preen
you mustn't preen
he mustn't preen
we mustn't preen
you mustn't preen
they mustn't preen 	I mustn't be preening
you mustn't be preening
he mustn't be preening
we mustn't be preening
you mustn't be preening
they mustn't be preening	I mustn't have preened
you mustn't have preened
he mustn't have preened
we mustn't have preened
you mustn't have preened
they mustn't have preened	I mustn't have been preening
you mustn't have been preening
he mustn't have been preening
we mustn't have been preening
you mustn't have been preening
they mustn't have been preening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I preen?
must you preen?
must he preen?
must we preen?
must you preen?
must they preen? 	must I be preening?
must you be preening?
must he be preening?
must we be preening?
must you be preening?
must they be preening? 	must I have preened?
must you have preened?
must he have preened?
must we have preened?
must you have preened?
must they have preened? 	must I have been preening?
must you have been preening?
must he have been preening?
must we have been preening?
must you have been preening?
must they have been preening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I preen?
mustn't you preen?
mustn't he preen?
mustn't we preen?
mustn't you preen?
mustn't they preen? 	mustn't I be preening?
mustn't you be preening?
mustn't he be preening?
mustn't we be preening?
mustn't you be preening?
mustn't they be preening? 	mustn't I have preened?
mustn't you have preened?
mustn't he have preened?
mustn't we have preened?
mustn't you have preened?
mustn't they have preened? 	mustn't I have been preening?
mustn't you have been preening?
mustn't he have been preening?
mustn't we have been preening?
mustn't you have been preening?
mustn't they have been preening?