English verb conjugation
MUST CLATTER

Regular verb: clatter - clattered - clattered

Affirmation

Simple form	V-ing form
I must clatter you must clatter he must clatter we must clatter you must clatter they must clatter	I must be clattering you must be clattering he must be clattering we must be clattering you must be clattering they must be clattering
Perfect	V-ing perfect
I must have clattered you must have clattered he must have clattered we must have clattered you must have clattered they must have clattered	I must have been clattering you must have been clattering he must have been clattering we must have been clattering you must have been clattering they must have been clattering

Negation

Simple form	V-ing form
I mustn't clatter you mustn't clatter he mustn't clatter we mustn't clatter you mustn't clatter they mustn't clatter	I mustn't be clattering you mustn't be clattering he mustn't be clattering we mustn't be clattering you mustn't be clattering they mustn't be clattering
Perfect	V-ing perfect
I mustn't have clattered you mustn't have clattered he mustn't have clattered we mustn't have clattered you mustn't have clattered they mustn't have clattered	I mustn't have been clattering you mustn't have been clattering he mustn't have been clattering we mustn't have been clattering you mustn't have been clattering they mustn't have been clattering

Interrogative form

Simple form	V-ing form
must I clatter? must you clatter? must he clatter? must we clatter? must you clatter? must they clatter?	must I be clattering? must you be clattering? must he be clattering? must we be clattering? must you be clattering? must they be clattering?
Perfect	V-ing perfect
must I have clattered? must you have clattered? must he have clattered? must we have clattered? must you have clattered? must they have clattered?	must I have been clattering? must you have been clattering? must he have been clattering? must we have been clattering? must you have been clattering? must they have been clattering?

Interro-negative form

Simple form	V-ing form
mustn't I clatter? mustn't you clatter? mustn't he clatter? mustn't we clatter? mustn't you clatter? mustn't they clatter?	mustn't I be clattering? mustn't you be clattering? mustn't he be clattering? mustn't we be clattering? mustn't you be clattering? mustn't they be clattering?
Perfect	V-ing perfect
mustn't I have clattered? mustn't you have clattered? mustn't he have clattered? mustn't we have clattered? mustn't you have clattered? mustn't they have clattered?	mustn't I have been clattering? mustn't you have been clattering? mustn't he have been clattering? mustn't we have been clattering? mustn't you have been clattering? mustn't they have been clattering?