I must putter you must putter he must putter we must putter you must putter they must putter
V-ing form
I must be puttering you must be puttering he must be puttering we must be puttering you must be puttering they must be puttering
Perfect
I must have puttered you must have puttered he must have puttered we must have puttered you must have puttered they must have puttered
V-ing perfect
I must have been puttering you must have been puttering he must have been puttering we must have been puttering you must have been puttering they must have been puttering
Negation
Simple form
I mustn't putter you mustn't putter he mustn't putter we mustn't putter you mustn't putter they mustn't putter
V-ing form
I mustn't be puttering you mustn't be puttering he mustn't be puttering we mustn't be puttering you mustn't be puttering they mustn't be puttering
Perfect
I mustn't have puttered you mustn't have puttered he mustn't have puttered we mustn't have puttered you mustn't have puttered they mustn't have puttered
V-ing perfect
I mustn't have been puttering you mustn't have been puttering he mustn't have been puttering we mustn't have been puttering you mustn't have been puttering they mustn't have been puttering
Interrogative form
Simple form
must I putter? must you putter? must he putter? must we putter? must you putter? must they putter?
V-ing form
must I be puttering? must you be puttering? must he be puttering? must we be puttering? must you be puttering? must they be puttering?
Perfect
must I have puttered? must you have puttered? must he have puttered? must we have puttered? must you have puttered? must they have puttered?
V-ing perfect
must I have been puttering? must you have been puttering? must he have been puttering? must we have been puttering? must you have been puttering? must they have been puttering?
Interro-negative form
Simple form
mustn't I putter? mustn't you putter? mustn't he putter? mustn't we putter? mustn't you putter? mustn't they putter?
V-ing form
mustn't I be puttering? mustn't you be puttering? mustn't he be puttering? mustn't we be puttering? mustn't you be puttering? mustn't they be puttering?
Perfect
mustn't I have puttered? mustn't you have puttered? mustn't he have puttered? mustn't we have puttered? mustn't you have puttered? mustn't they have puttered?
V-ing perfect
mustn't I have been puttering? mustn't you have been puttering? mustn't he have been puttering? mustn't we have been puttering? mustn't you have been puttering? mustn't they have been puttering?