English verb conjugation
MUST UNDERPLAY

Regular verb: underplay - underplayed - underplayed

Affirmation

Simple form	V-ing form
I must underplay you must underplay he must underplay we must underplay you must underplay they must underplay	I must be underplaying you must be underplaying he must be underplaying we must be underplaying you must be underplaying they must be underplaying
Perfect	V-ing perfect
I must have underplayed you must have underplayed he must have underplayed we must have underplayed you must have underplayed they must have underplayed	I must have been underplaying you must have been underplaying he must have been underplaying we must have been underplaying you must have been underplaying they must have been underplaying

Negation

Simple form	V-ing form
I mustn't underplay you mustn't underplay he mustn't underplay we mustn't underplay you mustn't underplay they mustn't underplay	I mustn't be underplaying you mustn't be underplaying he mustn't be underplaying we mustn't be underplaying you mustn't be underplaying they mustn't be underplaying
Perfect	V-ing perfect
I mustn't have underplayed you mustn't have underplayed he mustn't have underplayed we mustn't have underplayed you mustn't have underplayed they mustn't have underplayed	I mustn't have been underplaying you mustn't have been underplaying he mustn't have been underplaying we mustn't have been underplaying you mustn't have been underplaying they mustn't have been underplaying

Interrogative form

Simple form	V-ing form
must I underplay? must you underplay? must he underplay? must we underplay? must you underplay? must they underplay?	must I be underplaying? must you be underplaying? must he be underplaying? must we be underplaying? must you be underplaying? must they be underplaying?
Perfect	V-ing perfect
must I have underplayed? must you have underplayed? must he have underplayed? must we have underplayed? must you have underplayed? must they have underplayed?	must I have been underplaying? must you have been underplaying? must he have been underplaying? must we have been underplaying? must you have been underplaying? must they have been underplaying?

Interro-negative form

Simple form	V-ing form
mustn't I underplay? mustn't you underplay? mustn't he underplay? mustn't we underplay? mustn't you underplay? mustn't they underplay?	mustn't I be underplaying? mustn't you be underplaying? mustn't he be underplaying? mustn't we be underplaying? mustn't you be underplaying? mustn't they be underplaying?
Perfect	V-ing perfect
mustn't I have underplayed? mustn't you have underplayed? mustn't he have underplayed? mustn't we have underplayed? mustn't you have underplayed? mustn't they have underplayed?	mustn't I have been underplaying? mustn't you have been underplaying? mustn't he have been underplaying? mustn't we have been underplaying? mustn't you have been underplaying? mustn't they have been underplaying?