English verb conjugation
MUST GROUSE

Regular verb: grouse - groused - groused

Affirmation

Simple form	V-ing form
I must grouse you must grouse he must grouse we must grouse you must grouse they must grouse	I must be grousing you must be grousing he 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 he 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 he 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 must not grouse you must not grouse he must not grouse we must not grouse you must not grouse they must not grouse	I must not be grousing you must not be grousing he must not be grousing we must not be grousing you must not be grousing they must not be grousing
Perfect	V-ing perfect
I must not have groused you must not have groused he must not have groused we must not have groused you must not have groused they must not have groused	I must not have been grousing you must not have been grousing he must not have been grousing we must not have been grousing you must not have been grousing they must not have been grousing

Interrogative form

Simple form	V-ing form
must I grouse? must you grouse? must he grouse? must we grouse? must you grouse? must they grouse?	must I be grousing? must you be grousing? must he 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 he 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 he 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
must I not grouse? must you not grouse? must he not grouse? must we not grouse? must you not grouse? must they not grouse?	must I not be grousing? must you not be grousing? must he not be grousing? must we not be grousing? must you not be grousing? must they not be grousing?
Perfect	V-ing perfect
must I not have groused? must you not have groused? must he not have groused? must we not have groused? must you not have groused? must they not have groused?	must I not have been grousing? must you not have been grousing? must he not have been grousing? must we not have been grousing? must you not have been grousing? must they not have been grousing?