English verb conjugation
MUST ARC

Regular verb: arc - arced - arced

Affirmation

Simple form	V-ing form
I must arc you must arc she must arc we must arc you must arc they must arc	I must be arcing you must be arcing she must be arcing we must be arcing you must be arcing they must be arcing
Perfect	V-ing perfect
I must have arced you must have arced she 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 she must have been arcing we must have been arcing you must have been arcing they must have been arcing

Negation

Simple form	V-ing form
I mustn't arc you mustn't arc she 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 she mustn't be arcing we mustn't be arcing you mustn't be arcing they mustn't be arcing
Perfect	V-ing perfect
I mustn't have arced you mustn't have arced she 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 she mustn't have been arcing we mustn't have been arcing you mustn't have been arcing they mustn't have been arcing

Interrogative form

Simple form	V-ing form
must I arc? must you arc? must she arc? must we arc? must you arc? must they arc?	must I be arcing? must you be arcing? must she be arcing? must we be arcing? must you be arcing? must they be arcing?
Perfect	V-ing perfect
must I have arced? must you have arced? must she 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 she have been arcing? must we have been arcing? must you have been arcing? must they have been arcing?

Interro-negative form

Simple form	V-ing form
mustn't I arc? mustn't you arc? mustn't she 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 she be arcing? mustn't we be arcing? mustn't you be arcing? mustn't they be arcing?
Perfect	V-ing perfect
mustn't I have arced? mustn't you have arced? mustn't she 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 she have been arcing? mustn't we have been arcing? mustn't you have been arcing? mustn't they have been arcing?