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 must not muffle you must not muffle he must not muffle we must not muffle you must not muffle they must not muffle	I must not be muffling you must not be muffling he must not be muffling we must not be muffling you must not be muffling they must not be muffling
Perfect	V-ing perfect
I must not have muffled you must not have muffled he must not have muffled we must not have muffled you must not have muffled they must not have muffled	I must not have been muffling you must not have been muffling he must not have been muffling we must not have been muffling you must not have been muffling they must not 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
must I not muffle? must you not muffle? must he not muffle? must we not muffle? must you not muffle? must they not muffle?	must I not be muffling? must you not be muffling? must he not be muffling? must we not be muffling? must you not be muffling? must they not be muffling?
Perfect	V-ing perfect
must I not have muffled? must you not have muffled? must he not have muffled? must we not have muffled? must you not have muffled? must they not have muffled?	must I not have been muffling? must you not have been muffling? must he not have been muffling? must we not have been muffling? must you not have been muffling? must they not have been muffling?