must arc
Verbo regular: arc - arced- arced

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must arc
you must arc
he must arc
we must arc
you must arc
they must arc 	I must be arcing
you must be arcing
he must be arcing
we must be arcing
you must be arcing
they must be arcing	I must have arced
you must have arced
he must have arced
we must have arced
you must have arced
they must have arced	I must have been arcing
you must have been arcing
he must have been arcing
we must have been arcing
you must have been arcing
they must have been arcing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't arc
you mustn't arc
he mustn't arc
we mustn't arc
you mustn't arc
they mustn't arc 	I mustn't be arcing
you mustn't be arcing
he mustn't be arcing
we mustn't be arcing
you mustn't be arcing
they mustn't be arcing	I mustn't have arced
you mustn't have arced
he mustn't have arced
we mustn't have arced
you mustn't have arced
they mustn't have arced	I mustn't have been arcing
you mustn't have been arcing
he mustn't have been arcing
we mustn't have been arcing
you mustn't have been arcing
they mustn't have been arcing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I arc?
must you arc?
must he arc?
must we arc?
must you arc?
must they arc? 	must I be arcing?
must you be arcing?
must he be arcing?
must we be arcing?
must you be arcing?
must they be arcing? 	must I have arced?
must you have arced?
must he have arced?
must we have arced?
must you have arced?
must they have arced? 	must I have been arcing?
must you have been arcing?
must he have been arcing?
must we have been arcing?
must you have been arcing?
must they have been arcing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I arc?
mustn't you arc?
mustn't he arc?
mustn't we arc?
mustn't you arc?
mustn't they arc? 	mustn't I be arcing?
mustn't you be arcing?
mustn't he be arcing?
mustn't we be arcing?
mustn't you be arcing?
mustn't they be arcing? 	mustn't I have arced?
mustn't you have arced?
mustn't he have arced?
mustn't we have arced?
mustn't you have arced?
mustn't they have arced? 	mustn't I have been arcing?
mustn't you have been arcing?
mustn't he have been arcing?
mustn't we have been arcing?
mustn't you have been arcing?
mustn't they have been arcing?