must skulk
Verbo regolare: skulk - skulked- skulked

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must skulk
you must skulk
he must skulk
we must skulk
you must skulk
they must skulk 	I must be skulking
you must be skulking
he must be skulking
we must be skulking
you must be skulking
they must be skulking	I must have skulked
you must have skulked
he must have skulked
we must have skulked
you must have skulked
they must have skulked	I must have been skulking
you must have been skulking
he must have been skulking
we must have been skulking
you must have been skulking
they must have been skulking	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I mustn't skulk
you mustn't skulk
he mustn't skulk
we mustn't skulk
you mustn't skulk
they mustn't skulk 	I mustn't be skulking
you mustn't be skulking
he mustn't be skulking
we mustn't be skulking
you mustn't be skulking
they mustn't be skulking	I mustn't have skulked
you mustn't have skulked
he mustn't have skulked
we mustn't have skulked
you mustn't have skulked
they mustn't have skulked	I mustn't have been skulking
you mustn't have been skulking
he mustn't have been skulking
we mustn't have been skulking
you mustn't have been skulking
they mustn't have been skulking	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I skulk?
must you skulk?
must he skulk?
must we skulk?
must you skulk?
must they skulk? 	must I be skulking?
must you be skulking?
must he be skulking?
must we be skulking?
must you be skulking?
must they be skulking? 	must I have skulked?
must you have skulked?
must he have skulked?
must we have skulked?
must you have skulked?
must they have skulked? 	must I have been skulking?
must you have been skulking?
must he have been skulking?
must we have been skulking?
must you have been skulking?
must they have been skulking? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
mustn't I skulk?
mustn't you skulk?
mustn't he skulk?
mustn't we skulk?
mustn't you skulk?
mustn't they skulk? 	mustn't I be skulking?
mustn't you be skulking?
mustn't he be skulking?
mustn't we be skulking?
mustn't you be skulking?
mustn't they be skulking? 	mustn't I have skulked?
mustn't you have skulked?
mustn't he have skulked?
mustn't we have skulked?
mustn't you have skulked?
mustn't they have skulked? 	mustn't I have been skulking?
mustn't you have been skulking?
mustn't he have been skulking?
mustn't we have been skulking?
mustn't you have been skulking?
mustn't they have been skulking?