English verb conjugation
MUST SIT

Irregular verb: sit - sat - sat

Affirmation

Simple form	V-ing form
I must sit you must sit he must sit we must sit you must sit they must sit	I must be sitting you must be sitting he must be sitting we must be sitting you must be sitting they must be sitting
Perfect	V-ing perfect
I must have sat you must have sat he must have sat we must have sat you must have sat they must have sat	I must have been sitting you must have been sitting he must have been sitting we must have been sitting you must have been sitting they must have been sitting

Negation

Simple form	V-ing form
I must not sit you must not sit he must not sit we must not sit you must not sit they must not sit	I must not be sitting you must not be sitting he must not be sitting we must not be sitting you must not be sitting they must not be sitting
Perfect	V-ing perfect
I must not have sat you must not have sat he must not have sat we must not have sat you must not have sat they must not have sat	I must not have been sitting you must not have been sitting he must not have been sitting we must not have been sitting you must not have been sitting they must not have been sitting

Interrogative form

Simple form	V-ing form
must I sit? must you sit? must he sit? must we sit? must you sit? must they sit?	must I be sitting? must you be sitting? must he be sitting? must we be sitting? must you be sitting? must they be sitting?
Perfect	V-ing perfect
must I have sat? must you have sat? must he have sat? must we have sat? must you have sat? must they have sat?	must I have been sitting? must you have been sitting? must he have been sitting? must we have been sitting? must you have been sitting? must they have been sitting?

Interro-negative form

Simple form	V-ing form
must I not sit? must you not sit? must he not sit? must we not sit? must you not sit? must they not sit?	must I not be sitting? must you not be sitting? must he not be sitting? must we not be sitting? must you not be sitting? must they not be sitting?
Perfect	V-ing perfect
must I not have sat? must you not have sat? must he not have sat? must we not have sat? must you not have sat? must they not have sat?	must I not have been sitting? must you not have been sitting? must he not have been sitting? must we not have been sitting? must you not have been sitting? must they not have been sitting?