English verb conjugation
MUST GRUMBLE

Regular verb: grumble - grumbled - grumbled

Affirmation

Simple form	V-ing form
I must grumble you must grumble she must grumble we must grumble you must grumble they must grumble	I must be grumbling you must be grumbling she must be grumbling we must be grumbling you must be grumbling they must be grumbling
Perfect	V-ing perfect
I must have grumbled you must have grumbled she must have grumbled we must have grumbled you must have grumbled they must have grumbled	I must have been grumbling you must have been grumbling she must have been grumbling we must have been grumbling you must have been grumbling they must have been grumbling

Negation

Simple form	V-ing form
I mustn't grumble you mustn't grumble she mustn't grumble we mustn't grumble you mustn't grumble they mustn't grumble	I mustn't be grumbling you mustn't be grumbling she mustn't be grumbling we mustn't be grumbling you mustn't be grumbling they mustn't be grumbling
Perfect	V-ing perfect
I mustn't have grumbled you mustn't have grumbled she mustn't have grumbled we mustn't have grumbled you mustn't have grumbled they mustn't have grumbled	I mustn't have been grumbling you mustn't have been grumbling she mustn't have been grumbling we mustn't have been grumbling you mustn't have been grumbling they mustn't have been grumbling

Interrogative form

Simple form	V-ing form
must I grumble? must you grumble? must she grumble? must we grumble? must you grumble? must they grumble?	must I be grumbling? must you be grumbling? must she be grumbling? must we be grumbling? must you be grumbling? must they be grumbling?
Perfect	V-ing perfect
must I have grumbled? must you have grumbled? must she have grumbled? must we have grumbled? must you have grumbled? must they have grumbled?	must I have been grumbling? must you have been grumbling? must she have been grumbling? must we have been grumbling? must you have been grumbling? must they have been grumbling?

Interro-negative form

Simple form	V-ing form
mustn't I grumble? mustn't you grumble? mustn't she grumble? mustn't we grumble? mustn't you grumble? mustn't they grumble?	mustn't I be grumbling? mustn't you be grumbling? mustn't she be grumbling? mustn't we be grumbling? mustn't you be grumbling? mustn't they be grumbling?
Perfect	V-ing perfect
mustn't I have grumbled? mustn't you have grumbled? mustn't she have grumbled? mustn't we have grumbled? mustn't you have grumbled? mustn't they have grumbled?	mustn't I have been grumbling? mustn't you have been grumbling? mustn't she have been grumbling? mustn't we have been grumbling? mustn't you have been grumbling? mustn't they have been grumbling?