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 must not lament you must not lament she must not lament we must not lament you must not lament they must not lament	I must not be lamenting you must not be lamenting she must not be lamenting we must not be lamenting you must not be lamenting they must not be lamenting
Perfect	V-ing perfect
I must not have lamented you must not have lamented she must not have lamented we must not have lamented you must not have lamented they must not have lamented	I must not have been lamenting you must not have been lamenting she must not have been lamenting we must not have been lamenting you must not have been lamenting they must not 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
must I not lament? must you not lament? must she not lament? must we not lament? must you not lament? must they not lament?	must I not be lamenting? must you not be lamenting? must she not be lamenting? must we not be lamenting? must you not be lamenting? must they not be lamenting?
Perfect	V-ing perfect
must I not have lamented? must you not have lamented? must she not have lamented? must we not have lamented? must you not have lamented? must they not have lamented?	must I not have been lamenting? must you not have been lamenting? must she not have been lamenting? must we not have been lamenting? must you not have been lamenting? must they not have been lamenting?