English verb conjugation
MUST SOUND

Regular verb: sound - sounded - sounded

Affirmation

Simple form	V-ing form
I must sound you must sound she must sound we must sound you must sound they must sound	I must be sounding you must be sounding she 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 she 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 she 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 must not sound you must not sound she must not sound we must not sound you must not sound they must not sound	I must not be sounding you must not be sounding she must not be sounding we must not be sounding you must not be sounding they must not be sounding
Perfect	V-ing perfect
I must not have sounded you must not have sounded she must not have sounded we must not have sounded you must not have sounded they must not have sounded	I must not have been sounding you must not have been sounding she must not have been sounding we must not have been sounding you must not have been sounding they must not have been sounding

Interrogative form

Simple form	V-ing form
must I sound? must you sound? must she sound? must we sound? must you sound? must they sound?	must I be sounding? must you be sounding? must she 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 she 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 she 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
must I not sound? must you not sound? must she not sound? must we not sound? must you not sound? must they not sound?	must I not be sounding? must you not be sounding? must she not be sounding? must we not be sounding? must you not be sounding? must they not be sounding?
Perfect	V-ing perfect
must I not have sounded? must you not have sounded? must she not have sounded? must we not have sounded? must you not have sounded? must they not have sounded?	must I not have been sounding? must you not have been sounding? must she not have been sounding? must we not have been sounding? must you not have been sounding? must they not have been sounding?