English verb conjugation
MUST MUTTER

Regular verb: mutter - muttered - muttered

Affirmation

Simple form	V-ing form
I must mutter you must mutter she must mutter we must mutter you must mutter they must mutter	I must be muttering you must be muttering she must be muttering we must be muttering you must be muttering they must be muttering
Perfect	V-ing perfect
I must have muttered you must have muttered she must have muttered we must have muttered you must have muttered they must have muttered	I must have been muttering you must have been muttering she must have been muttering we must have been muttering you must have been muttering they must have been muttering

Negation

Simple form	V-ing form
I mustn't mutter you mustn't mutter she mustn't mutter we mustn't mutter you mustn't mutter they mustn't mutter	I mustn't be muttering you mustn't be muttering she mustn't be muttering we mustn't be muttering you mustn't be muttering they mustn't be muttering
Perfect	V-ing perfect
I mustn't have muttered you mustn't have muttered she mustn't have muttered we mustn't have muttered you mustn't have muttered they mustn't have muttered	I mustn't have been muttering you mustn't have been muttering she mustn't have been muttering we mustn't have been muttering you mustn't have been muttering they mustn't have been muttering

Interrogative form

Simple form	V-ing form
must I mutter? must you mutter? must she mutter? must we mutter? must you mutter? must they mutter?	must I be muttering? must you be muttering? must she be muttering? must we be muttering? must you be muttering? must they be muttering?
Perfect	V-ing perfect
must I have muttered? must you have muttered? must she have muttered? must we have muttered? must you have muttered? must they have muttered?	must I have been muttering? must you have been muttering? must she have been muttering? must we have been muttering? must you have been muttering? must they have been muttering?

Interro-negative form

Simple form	V-ing form
mustn't I mutter? mustn't you mutter? mustn't she mutter? mustn't we mutter? mustn't you mutter? mustn't they mutter?	mustn't I be muttering? mustn't you be muttering? mustn't she be muttering? mustn't we be muttering? mustn't you be muttering? mustn't they be muttering?
Perfect	V-ing perfect
mustn't I have muttered? mustn't you have muttered? mustn't she have muttered? mustn't we have muttered? mustn't you have muttered? mustn't they have muttered?	mustn't I have been muttering? mustn't you have been muttering? mustn't she have been muttering? mustn't we have been muttering? mustn't you have been muttering? mustn't they have been muttering?