English verb conjugation
MUST GROUCH

Regular verb: grouch - grouched - grouched

Affirmation

Simple form	V-ing form
I must grouch you must grouch he must grouch we must grouch you must grouch they must grouch	I must be grouching you must be grouching he must be grouching we must be grouching you must be grouching they must be grouching
Perfect	V-ing perfect
I must have grouched you must have grouched he must have grouched we must have grouched you must have grouched they must have grouched	I must have been grouching you must have been grouching he must have been grouching we must have been grouching you must have been grouching they must have been grouching

Negation

Simple form	V-ing form
I mustn't grouch you mustn't grouch he mustn't grouch we mustn't grouch you mustn't grouch they mustn't grouch	I mustn't be grouching you mustn't be grouching he mustn't be grouching we mustn't be grouching you mustn't be grouching they mustn't be grouching
Perfect	V-ing perfect
I mustn't have grouched you mustn't have grouched he mustn't have grouched we mustn't have grouched you mustn't have grouched they mustn't have grouched	I mustn't have been grouching you mustn't have been grouching he mustn't have been grouching we mustn't have been grouching you mustn't have been grouching they mustn't have been grouching

Interrogative form

Simple form	V-ing form
must I grouch? must you grouch? must he grouch? must we grouch? must you grouch? must they grouch?	must I be grouching? must you be grouching? must he be grouching? must we be grouching? must you be grouching? must they be grouching?
Perfect	V-ing perfect
must I have grouched? must you have grouched? must he have grouched? must we have grouched? must you have grouched? must they have grouched?	must I have been grouching? must you have been grouching? must he have been grouching? must we have been grouching? must you have been grouching? must they have been grouching?

Interro-negative form

Simple form	V-ing form
mustn't I grouch? mustn't you grouch? mustn't he grouch? mustn't we grouch? mustn't you grouch? mustn't they grouch?	mustn't I be grouching? mustn't you be grouching? mustn't he be grouching? mustn't we be grouching? mustn't you be grouching? mustn't they be grouching?
Perfect	V-ing perfect
mustn't I have grouched? mustn't you have grouched? mustn't he have grouched? mustn't we have grouched? mustn't you have grouched? mustn't they have grouched?	mustn't I have been grouching? mustn't you have been grouching? mustn't he have been grouching? mustn't we have been grouching? mustn't you have been grouching? mustn't they have been grouching?