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 mustn't itch you mustn't itch she mustn't itch we mustn't itch you mustn't itch they mustn't itch	I mustn't be itching you mustn't be itching she mustn't be itching we mustn't be itching you mustn't be itching they mustn't be itching
Perfect	V-ing perfect
I mustn't have itched you mustn't have itched she mustn't have itched we mustn't have itched you mustn't have itched they mustn't have itched	I mustn't have been itching you mustn't have been itching she mustn't have been itching we mustn't have been itching you mustn't have been itching they mustn't 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
mustn't I itch? mustn't you itch? mustn't she itch? mustn't we itch? mustn't you itch? mustn't they itch?	mustn't I be itching? mustn't you be itching? mustn't she be itching? mustn't we be itching? mustn't you be itching? mustn't they be itching?
Perfect	V-ing perfect
mustn't I have itched? mustn't you have itched? mustn't she have itched? mustn't we have itched? mustn't you have itched? mustn't they have itched?	mustn't I have been itching? mustn't you have been itching? mustn't she have been itching? mustn't we have been itching? mustn't you have been itching? mustn't they have been itching?