must perk
Verbo regolare: perk - perked- perked

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must perk
you must perk
he must perk
we must perk
you must perk
they must perk 	I must be perking
you must be perking
he must be perking
we must be perking
you must be perking
they must be perking	I must have perked
you must have perked
he must have perked
we must have perked
you must have perked
they must have perked	I must have been perking
you must have been perking
he must have been perking
we must have been perking
you must have been perking
they must have been perking	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I mustn't perk
you mustn't perk
he mustn't perk
we mustn't perk
you mustn't perk
they mustn't perk 	I mustn't be perking
you mustn't be perking
he mustn't be perking
we mustn't be perking
you mustn't be perking
they mustn't be perking	I mustn't have perked
you mustn't have perked
he mustn't have perked
we mustn't have perked
you mustn't have perked
they mustn't have perked	I mustn't have been perking
you mustn't have been perking
he mustn't have been perking
we mustn't have been perking
you mustn't have been perking
they mustn't have been perking	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I perk?
must you perk?
must he perk?
must we perk?
must you perk?
must they perk? 	must I be perking?
must you be perking?
must he be perking?
must we be perking?
must you be perking?
must they be perking? 	must I have perked?
must you have perked?
must he have perked?
must we have perked?
must you have perked?
must they have perked? 	must I have been perking?
must you have been perking?
must he have been perking?
must we have been perking?
must you have been perking?
must they have been perking? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
mustn't I perk?
mustn't you perk?
mustn't he perk?
mustn't we perk?
mustn't you perk?
mustn't they perk? 	mustn't I be perking?
mustn't you be perking?
mustn't he be perking?
mustn't we be perking?
mustn't you be perking?
mustn't they be perking? 	mustn't I have perked?
mustn't you have perked?
mustn't he have perked?
mustn't we have perked?
mustn't you have perked?
mustn't they have perked? 	mustn't I have been perking?
mustn't you have been perking?
mustn't he have been perking?
mustn't we have been perking?
mustn't you have been perking?
mustn't they have been perking?