English verb conjugation
MUST LAMENT

Regular verb: lament - lamented - lamented

Affirmation

Simple form	V-ing form
I must lament you must lament she must lament we must lament you must lament they must lament	I must be lamenting you must be lamenting she must be lamenting we must be lamenting you must be lamenting they must be lamenting
Perfect	V-ing perfect
I must have lamented you must have lamented she must have lamented we must have lamented you must have lamented they must have lamented	I must have been lamenting you must have been lamenting she must have been lamenting we must have been lamenting you must have been lamenting they must have been lamenting

Negation

Simple form	V-ing form
I mustn't lament you mustn't lament she mustn't lament we mustn't lament you mustn't lament they mustn't lament	I mustn't be lamenting you mustn't be lamenting she mustn't be lamenting we mustn't be lamenting you mustn't be lamenting they mustn't be lamenting
Perfect	V-ing perfect
I mustn't have lamented you mustn't have lamented she mustn't have lamented we mustn't have lamented you mustn't have lamented they mustn't have lamented	I mustn't have been lamenting you mustn't have been lamenting she mustn't have been lamenting we mustn't have been lamenting you mustn't have been lamenting they mustn't have been lamenting

Interrogative form

Simple form	V-ing form
must I lament? must you lament? must she lament? must we lament? must you lament? must they lament?	must I be lamenting? must you be lamenting? must she be lamenting? must we be lamenting? must you be lamenting? must they be lamenting?
Perfect	V-ing perfect
must I have lamented? must you have lamented? must she have lamented? must we have lamented? must you have lamented? must they have lamented?	must I have been lamenting? must you have been lamenting? must she have been lamenting? must we have been lamenting? must you have been lamenting? must they have been lamenting?

Interro-negative form

Simple form	V-ing form
mustn't I lament? mustn't you lament? mustn't she lament? mustn't we lament? mustn't you lament? mustn't they lament?	mustn't I be lamenting? mustn't you be lamenting? mustn't she be lamenting? mustn't we be lamenting? mustn't you be lamenting? mustn't they be lamenting?
Perfect	V-ing perfect
mustn't I have lamented? mustn't you have lamented? mustn't she have lamented? mustn't we have lamented? mustn't you have lamented? mustn't they have lamented?	mustn't I have been lamenting? mustn't you have been lamenting? mustn't she have been lamenting? mustn't we have been lamenting? mustn't you have been lamenting? mustn't they have been lamenting?