English verb conjugation
MUST ITCH

Regular verb: itch - itched - itched

Affirmation

Simple form	V-ing form
I must itch you must itch she must itch we must itch you must itch they must itch	I must be itching you must be itching she must be itching we must be itching you must be itching they must be itching
Perfect	V-ing perfect
I must have itched you must have itched she must have itched we must have itched you must have itched they must have itched	I must have been itching you must have been itching she must have been itching we must have been itching you must have been itching they must have been itching

Negation

Simple form	V-ing form
I must not itch you must not itch she must not itch we must not itch you must not itch they must not itch	I must not be itching you must not be itching she must not be itching we must not be itching you must not be itching they must not be itching
Perfect	V-ing perfect
I must not have itched you must not have itched she must not have itched we must not have itched you must not have itched they must not have itched	I must not have been itching you must not have been itching she must not have been itching we must not have been itching you must not have been itching they must not have been itching

Interrogative form

Simple form	V-ing form
must I itch? must you itch? must she itch? must we itch? must you itch? must they itch?	must I be itching? must you be itching? must she be itching? must we be itching? must you be itching? must they be itching?
Perfect	V-ing perfect
must I have itched? must you have itched? must she have itched? must we have itched? must you have itched? must they have itched?	must I have been itching? must you have been itching? must she have been itching? must we have been itching? must you have been itching? must they have been itching?

Interro-negative form

Simple form	V-ing form
must I not itch? must you not itch? must she not itch? must we not itch? must you not itch? must they not itch?	must I not be itching? must you not be itching? must she not be itching? must we not be itching? must you not be itching? must they not be itching?
Perfect	V-ing perfect
must I not have itched? must you not have itched? must she not have itched? must we not have itched? must you not have itched? must they not have itched?	must I not have been itching? must you not have been itching? must she not have been itching? must we not have been itching? must you not have been itching? must they not have been itching?