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 mustn't underline you mustn't underline he mustn't underline we mustn't underline you mustn't underline they mustn't underline	I mustn't be underlining you mustn't be underlining he mustn't be underlining we mustn't be underlining you mustn't be underlining they mustn't be underlining
Perfect	V-ing perfect
I mustn't have underlined you mustn't have underlined he mustn't have underlined we mustn't have underlined you mustn't have underlined they mustn't have underlined	I mustn't have been underlining you mustn't have been underlining he mustn't have been underlining we mustn't have been underlining you mustn't have been underlining they mustn't 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
mustn't I underline? mustn't you underline? mustn't he underline? mustn't we underline? mustn't you underline? mustn't they underline?	mustn't I be underlining? mustn't you be underlining? mustn't he be underlining? mustn't we be underlining? mustn't you be underlining? mustn't they be underlining?
Perfect	V-ing perfect
mustn't I have underlined? mustn't you have underlined? mustn't he have underlined? mustn't we have underlined? mustn't you have underlined? mustn't they have underlined?	mustn't I have been underlining? mustn't you have been underlining? mustn't he have been underlining? mustn't we have been underlining? mustn't you have been underlining? mustn't they have been underlining?