English verb conjugation
MUST TACK

Regular verb: tack - tacked - tacked

Affirmation

Simple form	V-ing form
I must tack you must tack she must tack we must tack you must tack they must tack	I must be tacking you must be tacking she must be tacking we must be tacking you must be tacking they must be tacking
Perfect	V-ing perfect
I must have tacked you must have tacked she must have tacked we must have tacked you must have tacked they must have tacked	I must have been tacking you must have been tacking she must have been tacking we must have been tacking you must have been tacking they must have been tacking

Negation

Simple form	V-ing form
I must not tack you must not tack she must not tack we must not tack you must not tack they must not tack	I must not be tacking you must not be tacking she must not be tacking we must not be tacking you must not be tacking they must not be tacking
Perfect	V-ing perfect
I must not have tacked you must not have tacked she must not have tacked we must not have tacked you must not have tacked they must not have tacked	I must not have been tacking you must not have been tacking she must not have been tacking we must not have been tacking you must not have been tacking they must not have been tacking

Interrogative form

Simple form	V-ing form
must I tack? must you tack? must she tack? must we tack? must you tack? must they tack?	must I be tacking? must you be tacking? must she be tacking? must we be tacking? must you be tacking? must they be tacking?
Perfect	V-ing perfect
must I have tacked? must you have tacked? must she have tacked? must we have tacked? must you have tacked? must they have tacked?	must I have been tacking? must you have been tacking? must she have been tacking? must we have been tacking? must you have been tacking? must they have been tacking?

Interro-negative form

Simple form	V-ing form
must I not tack? must you not tack? must she not tack? must we not tack? must you not tack? must they not tack?	must I not be tacking? must you not be tacking? must she not be tacking? must we not be tacking? must you not be tacking? must they not be tacking?
Perfect	V-ing perfect
must I not have tacked? must you not have tacked? must she not have tacked? must we not have tacked? must you not have tacked? must they not have tacked?	must I not have been tacking? must you not have been tacking? must she not have been tacking? must we not have been tacking? must you not have been tacking? must they not have been tacking?