English verb conjugation
MUST MOUSE

Regular verb: mouse - moused - moused

Affirmation

Simple form	V-ing form
I must mouse you must mouse he must mouse we must mouse you must mouse they must mouse	I must be mousing you must be mousing he must be mousing we must be mousing you must be mousing they must be mousing
Perfect	V-ing perfect
I must have moused you must have moused he must have moused we must have moused you must have moused they must have moused	I must have been mousing you must have been mousing he must have been mousing we must have been mousing you must have been mousing they must have been mousing

Negation

Simple form	V-ing form
I mustn't mouse you mustn't mouse he mustn't mouse we mustn't mouse you mustn't mouse they mustn't mouse	I mustn't be mousing you mustn't be mousing he mustn't be mousing we mustn't be mousing you mustn't be mousing they mustn't be mousing
Perfect	V-ing perfect
I mustn't have moused you mustn't have moused he mustn't have moused we mustn't have moused you mustn't have moused they mustn't have moused	I mustn't have been mousing you mustn't have been mousing he mustn't have been mousing we mustn't have been mousing you mustn't have been mousing they mustn't have been mousing

Interrogative form

Simple form	V-ing form
must I mouse? must you mouse? must he mouse? must we mouse? must you mouse? must they mouse?	must I be mousing? must you be mousing? must he be mousing? must we be mousing? must you be mousing? must they be mousing?
Perfect	V-ing perfect
must I have moused? must you have moused? must he have moused? must we have moused? must you have moused? must they have moused?	must I have been mousing? must you have been mousing? must he have been mousing? must we have been mousing? must you have been mousing? must they have been mousing?

Interro-negative form

Simple form	V-ing form
mustn't I mouse? mustn't you mouse? mustn't he mouse? mustn't we mouse? mustn't you mouse? mustn't they mouse?	mustn't I be mousing? mustn't you be mousing? mustn't he be mousing? mustn't we be mousing? mustn't you be mousing? mustn't they be mousing?
Perfect	V-ing perfect
mustn't I have moused? mustn't you have moused? mustn't he have moused? mustn't we have moused? mustn't you have moused? mustn't they have moused?	mustn't I have been mousing? mustn't you have been mousing? mustn't he have been mousing? mustn't we have been mousing? mustn't you have been mousing? mustn't they have been mousing?