English verb conjugation
MUST INTERVENE

Regular verb: intervene - intervened - intervened

Affirmation

Simple form	V-ing form
I must intervene you must intervene he must intervene we must intervene you must intervene they must intervene	I must be intervening you must be intervening he must be intervening we must be intervening you must be intervening they must be intervening
Perfect	V-ing perfect
I must have intervened you must have intervened he must have intervened we must have intervened you must have intervened they must have intervened	I must have been intervening you must have been intervening he must have been intervening we must have been intervening you must have been intervening they must have been intervening

Negation

Simple form	V-ing form
I must not intervene you must not intervene he must not intervene we must not intervene you must not intervene they must not intervene	I must not be intervening you must not be intervening he must not be intervening we must not be intervening you must not be intervening they must not be intervening
Perfect	V-ing perfect
I must not have intervened you must not have intervened he must not have intervened we must not have intervened you must not have intervened they must not have intervened	I must not have been intervening you must not have been intervening he must not have been intervening we must not have been intervening you must not have been intervening they must not have been intervening

Interrogative form

Simple form	V-ing form
must I intervene? must you intervene? must he intervene? must we intervene? must you intervene? must they intervene?	must I be intervening? must you be intervening? must he be intervening? must we be intervening? must you be intervening? must they be intervening?
Perfect	V-ing perfect
must I have intervened? must you have intervened? must he have intervened? must we have intervened? must you have intervened? must they have intervened?	must I have been intervening? must you have been intervening? must he have been intervening? must we have been intervening? must you have been intervening? must they have been intervening?

Interro-negative form

Simple form	V-ing form
must I not intervene? must you not intervene? must he not intervene? must we not intervene? must you not intervene? must they not intervene?	must I not be intervening? must you not be intervening? must he not be intervening? must we not be intervening? must you not be intervening? must they not be intervening?
Perfect	V-ing perfect
must I not have intervened? must you not have intervened? must he not have intervened? must we not have intervened? must you not have intervened? must they not have intervened?	must I not have been intervening? must you not have been intervening? must he not have been intervening? must we not have been intervening? must you not have been intervening? must they not have been intervening?