English verb conjugation
MUST GROUSE

Regular verb: grouse - groused - groused

Affirmation

Simple form	V-ing form
I must grouse you must grouse she must grouse we must grouse you must grouse they must grouse	I must be grousing you must be grousing she must be grousing we must be grousing you must be grousing they must be grousing
Perfect	V-ing perfect
I must have groused you must have groused she must have groused we must have groused you must have groused they must have groused	I must have been grousing you must have been grousing she must have been grousing we must have been grousing you must have been grousing they must have been grousing

Negation

Simple form	V-ing form
I mustn't grouse you mustn't grouse she mustn't grouse we mustn't grouse you mustn't grouse they mustn't grouse	I mustn't be grousing you mustn't be grousing she mustn't be grousing we mustn't be grousing you mustn't be grousing they mustn't be grousing
Perfect	V-ing perfect
I mustn't have groused you mustn't have groused she mustn't have groused we mustn't have groused you mustn't have groused they mustn't have groused	I mustn't have been grousing you mustn't have been grousing she mustn't have been grousing we mustn't have been grousing you mustn't have been grousing they mustn't have been grousing

Interrogative form

Simple form	V-ing form
must I grouse? must you grouse? must she grouse? must we grouse? must you grouse? must they grouse?	must I be grousing? must you be grousing? must she be grousing? must we be grousing? must you be grousing? must they be grousing?
Perfect	V-ing perfect
must I have groused? must you have groused? must she have groused? must we have groused? must you have groused? must they have groused?	must I have been grousing? must you have been grousing? must she have been grousing? must we have been grousing? must you have been grousing? must they have been grousing?

Interro-negative form

Simple form	V-ing form
mustn't I grouse? mustn't you grouse? mustn't she grouse? mustn't we grouse? mustn't you grouse? mustn't they grouse?	mustn't I be grousing? mustn't you be grousing? mustn't she be grousing? mustn't we be grousing? mustn't you be grousing? mustn't they be grousing?
Perfect	V-ing perfect
mustn't I have groused? mustn't you have groused? mustn't she have groused? mustn't we have groused? mustn't you have groused? mustn't they have groused?	mustn't I have been grousing? mustn't you have been grousing? mustn't she have been grousing? mustn't we have been grousing? mustn't you have been grousing? mustn't they have been grousing?