English verb conjugation
MUST UNDERSCORE

Regular verb: underscore - underscored - underscored

Affirmation

Simple form	V-ing form
I must underscore you must underscore he must underscore we must underscore you must underscore they must underscore	I must be underscoring you must be underscoring he must be underscoring we must be underscoring you must be underscoring they must be underscoring
Perfect	V-ing perfect
I must have underscored you must have underscored he must have underscored we must have underscored you must have underscored they must have underscored	I must have been underscoring you must have been underscoring he must have been underscoring we must have been underscoring you must have been underscoring they must have been underscoring

Negation

Simple form	V-ing form
I mustn't underscore you mustn't underscore he mustn't underscore we mustn't underscore you mustn't underscore they mustn't underscore	I mustn't be underscoring you mustn't be underscoring he mustn't be underscoring we mustn't be underscoring you mustn't be underscoring they mustn't be underscoring
Perfect	V-ing perfect
I mustn't have underscored you mustn't have underscored he mustn't have underscored we mustn't have underscored you mustn't have underscored they mustn't have underscored	I mustn't have been underscoring you mustn't have been underscoring he mustn't have been underscoring we mustn't have been underscoring you mustn't have been underscoring they mustn't have been underscoring

Interrogative form

Simple form	V-ing form
must I underscore? must you underscore? must he underscore? must we underscore? must you underscore? must they underscore?	must I be underscoring? must you be underscoring? must he be underscoring? must we be underscoring? must you be underscoring? must they be underscoring?
Perfect	V-ing perfect
must I have underscored? must you have underscored? must he have underscored? must we have underscored? must you have underscored? must they have underscored?	must I have been underscoring? must you have been underscoring? must he have been underscoring? must we have been underscoring? must you have been underscoring? must they have been underscoring?

Interro-negative form

Simple form	V-ing form
mustn't I underscore? mustn't you underscore? mustn't he underscore? mustn't we underscore? mustn't you underscore? mustn't they underscore?	mustn't I be underscoring? mustn't you be underscoring? mustn't he be underscoring? mustn't we be underscoring? mustn't you be underscoring? mustn't they be underscoring?
Perfect	V-ing perfect
mustn't I have underscored? mustn't you have underscored? mustn't he have underscored? mustn't we have underscored? mustn't you have underscored? mustn't they have underscored?	mustn't I have been underscoring? mustn't you have been underscoring? mustn't he have been underscoring? mustn't we have been underscoring? mustn't you have been underscoring? mustn't they have been underscoring?