Conjugación del verbo inglés
MUST UNDERUSE

Verbo regular: underuse - underused - underused

Afirmación

Forma simple	Forma con V-ing
I must underuse you must underuse he must underuse we must underuse you must underuse they must underuse	I must be underusing you must be underusing he must be underusing we must be underusing you must be underusing they must be underusing
Perfecto	Perfecto con V-ing
I must have underused you must have underused he must have underused we must have underused you must have underused they must have underused	I must have been underusing you must have been underusing he must have been underusing we must have been underusing you must have been underusing they must have been underusing

Negación

Forma simple	Forma con V-ing
I mustn't underuse you mustn't underuse he mustn't underuse we mustn't underuse you mustn't underuse they mustn't underuse	I mustn't be underusing you mustn't be underusing he mustn't be underusing we mustn't be underusing you mustn't be underusing they mustn't be underusing
Perfecto	Perfecto con V-ing
I mustn't have underused you mustn't have underused he mustn't have underused we mustn't have underused you mustn't have underused they mustn't have underused	I mustn't have been underusing you mustn't have been underusing he mustn't have been underusing we mustn't have been underusing you mustn't have been underusing they mustn't have been underusing

Forma interrogativa

Forma simple	Forma con V-ing
must I underuse? must you underuse? must he underuse? must we underuse? must you underuse? must they underuse?	must I be underusing? must you be underusing? must he be underusing? must we be underusing? must you be underusing? must they be underusing?
Perfecto	Perfecto con V-ing
must I have underused? must you have underused? must he have underused? must we have underused? must you have underused? must they have underused?	must I have been underusing? must you have been underusing? must he have been underusing? must we have been underusing? must you have been underusing? must they have been underusing?

Forma interro-negativa

Forma simple	Forma con V-ing
mustn't I underuse? mustn't you underuse? mustn't he underuse? mustn't we underuse? mustn't you underuse? mustn't they underuse?	mustn't I be underusing? mustn't you be underusing? mustn't he be underusing? mustn't we be underusing? mustn't you be underusing? mustn't they be underusing?
Perfecto	Perfecto con V-ing
mustn't I have underused? mustn't you have underused? mustn't he have underused? mustn't we have underused? mustn't you have underused? mustn't they have underused?	mustn't I have been underusing? mustn't you have been underusing? mustn't he have been underusing? mustn't we have been underusing? mustn't you have been underusing? mustn't they have been underusing?