English verb conjugation
MUST TEACH

Irregular verb: teach - taught - taught

Affirmation

Simple form	V-ing form
I must teach you must teach he must teach we must teach you must teach they must teach	I must be teaching you must be teaching he must be teaching we must be teaching you must be teaching they must be teaching
Perfect	V-ing perfect
I must have taught you must have taught he must have taught we must have taught you must have taught they must have taught	I must have been teaching you must have been teaching he must have been teaching we must have been teaching you must have been teaching they must have been teaching

Negation

Simple form	V-ing form
I mustn't teach you mustn't teach he mustn't teach we mustn't teach you mustn't teach they mustn't teach	I mustn't be teaching you mustn't be teaching he mustn't be teaching we mustn't be teaching you mustn't be teaching they mustn't be teaching
Perfect	V-ing perfect
I mustn't have taught you mustn't have taught he mustn't have taught we mustn't have taught you mustn't have taught they mustn't have taught	I mustn't have been teaching you mustn't have been teaching he mustn't have been teaching we mustn't have been teaching you mustn't have been teaching they mustn't have been teaching

Interrogative form

Simple form	V-ing form
must I teach? must you teach? must he teach? must we teach? must you teach? must they teach?	must I be teaching? must you be teaching? must he be teaching? must we be teaching? must you be teaching? must they be teaching?
Perfect	V-ing perfect
must I have taught? must you have taught? must he have taught? must we have taught? must you have taught? must they have taught?	must I have been teaching? must you have been teaching? must he have been teaching? must we have been teaching? must you have been teaching? must they have been teaching?

Interro-negative form

Simple form	V-ing form
mustn't I teach? mustn't you teach? mustn't he teach? mustn't we teach? mustn't you teach? mustn't they teach?	mustn't I be teaching? mustn't you be teaching? mustn't he be teaching? mustn't we be teaching? mustn't you be teaching? mustn't they be teaching?
Perfect	V-ing perfect
mustn't I have taught? mustn't you have taught? mustn't he have taught? mustn't we have taught? mustn't you have taught? mustn't they have taught?	mustn't I have been teaching? mustn't you have been teaching? mustn't he have been teaching? mustn't we have been teaching? mustn't you have been teaching? mustn't they have been teaching?