English verb conjugation
MUST GROUCH

Regular verb: grouch - grouched - grouched

Affirmation

Simple form	V-ing form
I must grouch you must grouch she must grouch we must grouch you must grouch they must grouch	I must be grouching you must be grouching she 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 she 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 she 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 she 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 she 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 she 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 she 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 she grouch? must we grouch? must you grouch? must they grouch?	must I be grouching? must you be grouching? must she 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 she 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 she 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 she 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 she 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 she 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 she have been grouching? mustn't we have been grouching? mustn't you have been grouching? mustn't they have been grouching?