English verb conjugation
MUST ESTABLISH

Regular verb: establish - established - established

Affirmation

Simple form	V-ing form
I must establish you must establish he must establish we must establish you must establish they must establish	I must be establishing you must be establishing he must be establishing we must be establishing you must be establishing they must be establishing
Perfect	V-ing perfect
I must have established you must have established he must have established we must have established you must have established they must have established	I must have been establishing you must have been establishing he must have been establishing we must have been establishing you must have been establishing they must have been establishing

Negation

Simple form	V-ing form
I mustn't establish you mustn't establish he mustn't establish we mustn't establish you mustn't establish they mustn't establish	I mustn't be establishing you mustn't be establishing he mustn't be establishing we mustn't be establishing you mustn't be establishing they mustn't be establishing
Perfect	V-ing perfect
I mustn't have established you mustn't have established he mustn't have established we mustn't have established you mustn't have established they mustn't have established	I mustn't have been establishing you mustn't have been establishing he mustn't have been establishing we mustn't have been establishing you mustn't have been establishing they mustn't have been establishing

Interrogative form

Simple form	V-ing form
must I establish? must you establish? must he establish? must we establish? must you establish? must they establish?	must I be establishing? must you be establishing? must he be establishing? must we be establishing? must you be establishing? must they be establishing?
Perfect	V-ing perfect
must I have established? must you have established? must he have established? must we have established? must you have established? must they have established?	must I have been establishing? must you have been establishing? must he have been establishing? must we have been establishing? must you have been establishing? must they have been establishing?

Interro-negative form

Simple form	V-ing form
mustn't I establish? mustn't you establish? mustn't he establish? mustn't we establish? mustn't you establish? mustn't they establish?	mustn't I be establishing? mustn't you be establishing? mustn't he be establishing? mustn't we be establishing? mustn't you be establishing? mustn't they be establishing?
Perfect	V-ing perfect
mustn't I have established? mustn't you have established? mustn't he have established? mustn't we have established? mustn't you have established? mustn't they have established?	mustn't I have been establishing? mustn't you have been establishing? mustn't he have been establishing? mustn't we have been establishing? mustn't you have been establishing? mustn't they have been establishing?