must dust
Verbo regolare: dust - dusted- dusted

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must dust
you must dust
he must dust
we must dust
you must dust
they must dust 	I must be dusting
you must be dusting
he must be dusting
we must be dusting
you must be dusting
they must be dusting	I must have dusted
you must have dusted
he must have dusted
we must have dusted
you must have dusted
they must have dusted	I must have been dusting
you must have been dusting
he must have been dusting
we must have been dusting
you must have been dusting
they must have been dusting	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I mustn't dust
you mustn't dust
he mustn't dust
we mustn't dust
you mustn't dust
they mustn't dust 	I mustn't be dusting
you mustn't be dusting
he mustn't be dusting
we mustn't be dusting
you mustn't be dusting
they mustn't be dusting	I mustn't have dusted
you mustn't have dusted
he mustn't have dusted
we mustn't have dusted
you mustn't have dusted
they mustn't have dusted	I mustn't have been dusting
you mustn't have been dusting
he mustn't have been dusting
we mustn't have been dusting
you mustn't have been dusting
they mustn't have been dusting	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I dust?
must you dust?
must he dust?
must we dust?
must you dust?
must they dust? 	must I be dusting?
must you be dusting?
must he be dusting?
must we be dusting?
must you be dusting?
must they be dusting? 	must I have dusted?
must you have dusted?
must he have dusted?
must we have dusted?
must you have dusted?
must they have dusted? 	must I have been dusting?
must you have been dusting?
must he have been dusting?
must we have been dusting?
must you have been dusting?
must they have been dusting? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
mustn't I dust?
mustn't you dust?
mustn't he dust?
mustn't we dust?
mustn't you dust?
mustn't they dust? 	mustn't I be dusting?
mustn't you be dusting?
mustn't he be dusting?
mustn't we be dusting?
mustn't you be dusting?
mustn't they be dusting? 	mustn't I have dusted?
mustn't you have dusted?
mustn't he have dusted?
mustn't we have dusted?
mustn't you have dusted?
mustn't they have dusted? 	mustn't I have been dusting?
mustn't you have been dusting?
mustn't he have been dusting?
mustn't we have been dusting?
mustn't you have been dusting?
mustn't they have been dusting?