English verb conjugation
MUST UNDERLINE

Regular verb: underline - underlined - underlined

Affirmation

Simple form	V-ing form
I must underline you must underline he must underline we must underline you must underline they must underline	I must be underlining you must be underlining he must be underlining we must be underlining you must be underlining they must be underlining
Perfect	V-ing perfect
I must have underlined you must have underlined he must have underlined we must have underlined you must have underlined they must have underlined	I must have been underlining you must have been underlining he must have been underlining we must have been underlining you must have been underlining they must have been underlining

Negation

Simple form	V-ing form
I must not underline you must not underline he must not underline we must not underline you must not underline they must not underline	I must not be underlining you must not be underlining he must not be underlining we must not be underlining you must not be underlining they must not be underlining
Perfect	V-ing perfect
I must not have underlined you must not have underlined he must not have underlined we must not have underlined you must not have underlined they must not have underlined	I must not have been underlining you must not have been underlining he must not have been underlining we must not have been underlining you must not have been underlining they must not have been underlining

Interrogative form

Simple form	V-ing form
must I underline? must you underline? must he underline? must we underline? must you underline? must they underline?	must I be underlining? must you be underlining? must he be underlining? must we be underlining? must you be underlining? must they be underlining?
Perfect	V-ing perfect
must I have underlined? must you have underlined? must he have underlined? must we have underlined? must you have underlined? must they have underlined?	must I have been underlining? must you have been underlining? must he have been underlining? must we have been underlining? must you have been underlining? must they have been underlining?

Interro-negative form

Simple form	V-ing form
must I not underline? must you not underline? must he not underline? must we not underline? must you not underline? must they not underline?	must I not be underlining? must you not be underlining? must he not be underlining? must we not be underlining? must you not be underlining? must they not be underlining?
Perfect	V-ing perfect
must I not have underlined? must you not have underlined? must he not have underlined? must we not have underlined? must you not have underlined? must they not have underlined?	must I not have been underlining? must you not have been underlining? must he not have been underlining? must we not have been underlining? must you not have been underlining? must they not have been underlining?