Regular verb: establish - established - established
Affirmation
Simple form
I must establish you must establish she must establish we must establish you must establish they must establish
V-ing form
I must be establishing you must be establishing she must be establishing we must be establishing you must be establishing they must be establishing
Perfect
I must have established you must have established she must have established we must have established you must have established they must have established
V-ing perfect
I must have been establishing you must have been establishing she must have been establishing we must have been establishing you must have been establishing they must have been establishing
Negation
Simple form
I mustn't establish you mustn't establish she mustn't establish we mustn't establish you mustn't establish they mustn't establish
V-ing form
I mustn't be establishing you mustn't be establishing she mustn't be establishing we mustn't be establishing you mustn't be establishing they mustn't be establishing
Perfect
I mustn't have established you mustn't have established she mustn't have established we mustn't have established you mustn't have established they mustn't have established
V-ing perfect
I mustn't have been establishing you mustn't have been establishing she 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
must I establish? must you establish? must she establish? must we establish? must you establish? must they establish?
V-ing form
must I be establishing? must you be establishing? must she be establishing? must we be establishing? must you be establishing? must they be establishing?
Perfect
must I have established? must you have established? must she have established? must we have established? must you have established? must they have established?
V-ing perfect
must I have been establishing? must you have been establishing? must she have been establishing? must we have been establishing? must you have been establishing? must they have been establishing?
Interro-negative form
Simple form
mustn't I establish? mustn't you establish? mustn't she establish? mustn't we establish? mustn't you establish? mustn't they establish?
V-ing form
mustn't I be establishing? mustn't you be establishing? mustn't she be establishing? mustn't we be establishing? mustn't you be establishing? mustn't they be establishing?
Perfect
mustn't I have established? mustn't you have established? mustn't she have established? mustn't we have established? mustn't you have established? mustn't they have established?
V-ing perfect
mustn't I have been establishing? mustn't you have been establishing? mustn't she have been establishing? mustn't we have been establishing? mustn't you have been establishing? mustn't they have been establishing?