English verb conjugation
MUST MUFFLE

Regular verb: muffle - muffled - muffled

Affirmation

Simple form	V-ing form
I must muffle you must muffle he must muffle we must muffle you must muffle they must muffle	I must be muffling you must be muffling he must be muffling we must be muffling you must be muffling they must be muffling
Perfect	V-ing perfect
I must have muffled you must have muffled he must have muffled we must have muffled you must have muffled they must have muffled	I must have been muffling you must have been muffling he must have been muffling we must have been muffling you must have been muffling they must have been muffling

Negation

Simple form	V-ing form
I mustn't muffle you mustn't muffle he mustn't muffle we mustn't muffle you mustn't muffle they mustn't muffle	I mustn't be muffling you mustn't be muffling he mustn't be muffling we mustn't be muffling you mustn't be muffling they mustn't be muffling
Perfect	V-ing perfect
I mustn't have muffled you mustn't have muffled he mustn't have muffled we mustn't have muffled you mustn't have muffled they mustn't have muffled	I mustn't have been muffling you mustn't have been muffling he mustn't have been muffling we mustn't have been muffling you mustn't have been muffling they mustn't have been muffling

Interrogative form

Simple form	V-ing form
must I muffle? must you muffle? must he muffle? must we muffle? must you muffle? must they muffle?	must I be muffling? must you be muffling? must he be muffling? must we be muffling? must you be muffling? must they be muffling?
Perfect	V-ing perfect
must I have muffled? must you have muffled? must he have muffled? must we have muffled? must you have muffled? must they have muffled?	must I have been muffling? must you have been muffling? must he have been muffling? must we have been muffling? must you have been muffling? must they have been muffling?

Interro-negative form

Simple form	V-ing form
mustn't I muffle? mustn't you muffle? mustn't he muffle? mustn't we muffle? mustn't you muffle? mustn't they muffle?	mustn't I be muffling? mustn't you be muffling? mustn't he be muffling? mustn't we be muffling? mustn't you be muffling? mustn't they be muffling?
Perfect	V-ing perfect
mustn't I have muffled? mustn't you have muffled? mustn't he have muffled? mustn't we have muffled? mustn't you have muffled? mustn't they have muffled?	mustn't I have been muffling? mustn't you have been muffling? mustn't he have been muffling? mustn't we have been muffling? mustn't you have been muffling? mustn't they have been muffling?