English verb conjugation
MUST SOUND

Regular verb: sound - sounded - sounded

Affirmation

Simple form	V-ing form
I must sound you must sound he must sound we must sound you must sound they must sound	I must be sounding you must be sounding he must be sounding we must be sounding you must be sounding they must be sounding
Perfect	V-ing perfect
I must have sounded you must have sounded he must have sounded we must have sounded you must have sounded they must have sounded	I must have been sounding you must have been sounding he must have been sounding we must have been sounding you must have been sounding they must have been sounding

Negation

Simple form	V-ing form
I mustn't sound you mustn't sound he mustn't sound we mustn't sound you mustn't sound they mustn't sound	I mustn't be sounding you mustn't be sounding he mustn't be sounding we mustn't be sounding you mustn't be sounding they mustn't be sounding
Perfect	V-ing perfect
I mustn't have sounded you mustn't have sounded he mustn't have sounded we mustn't have sounded you mustn't have sounded they mustn't have sounded	I mustn't have been sounding you mustn't have been sounding he mustn't have been sounding we mustn't have been sounding you mustn't have been sounding they mustn't have been sounding

Interrogative form

Simple form	V-ing form
must I sound? must you sound? must he sound? must we sound? must you sound? must they sound?	must I be sounding? must you be sounding? must he be sounding? must we be sounding? must you be sounding? must they be sounding?
Perfect	V-ing perfect
must I have sounded? must you have sounded? must he have sounded? must we have sounded? must you have sounded? must they have sounded?	must I have been sounding? must you have been sounding? must he have been sounding? must we have been sounding? must you have been sounding? must they have been sounding?

Interro-negative form

Simple form	V-ing form
mustn't I sound? mustn't you sound? mustn't he sound? mustn't we sound? mustn't you sound? mustn't they sound?	mustn't I be sounding? mustn't you be sounding? mustn't he be sounding? mustn't we be sounding? mustn't you be sounding? mustn't they be sounding?
Perfect	V-ing perfect
mustn't I have sounded? mustn't you have sounded? mustn't he have sounded? mustn't we have sounded? mustn't you have sounded? mustn't they have sounded?	mustn't I have been sounding? mustn't you have been sounding? mustn't he have been sounding? mustn't we have been sounding? mustn't you have been sounding? mustn't they have been sounding?