English verb conjugation
MUST STEEPEN

Regular verb: steepen - steepened - steepened

Affirmation

Simple form	V-ing form
I must steepen you must steepen he must steepen we must steepen you must steepen they must steepen	I must be steepening you must be steepening he must be steepening we must be steepening you must be steepening they must be steepening
Perfect	V-ing perfect
I must have steepened you must have steepened he must have steepened we must have steepened you must have steepened they must have steepened	I must have been steepening you must have been steepening he must have been steepening we must have been steepening you must have been steepening they must have been steepening

Negation

Simple form	V-ing form
I must not steepen you must not steepen he must not steepen we must not steepen you must not steepen they must not steepen	I must not be steepening you must not be steepening he must not be steepening we must not be steepening you must not be steepening they must not be steepening
Perfect	V-ing perfect
I must not have steepened you must not have steepened he must not have steepened we must not have steepened you must not have steepened they must not have steepened	I must not have been steepening you must not have been steepening he must not have been steepening we must not have been steepening you must not have been steepening they must not have been steepening

Interrogative form

Simple form	V-ing form
must I steepen? must you steepen? must he steepen? must we steepen? must you steepen? must they steepen?	must I be steepening? must you be steepening? must he be steepening? must we be steepening? must you be steepening? must they be steepening?
Perfect	V-ing perfect
must I have steepened? must you have steepened? must he have steepened? must we have steepened? must you have steepened? must they have steepened?	must I have been steepening? must you have been steepening? must he have been steepening? must we have been steepening? must you have been steepening? must they have been steepening?

Interro-negative form

Simple form	V-ing form
must I not steepen? must you not steepen? must he not steepen? must we not steepen? must you not steepen? must they not steepen?	must I not be steepening? must you not be steepening? must he not be steepening? must we not be steepening? must you not be steepening? must they not be steepening?
Perfect	V-ing perfect
must I not have steepened? must you not have steepened? must he not have steepened? must we not have steepened? must you not have steepened? must they not have steepened?	must I not have been steepening? must you not have been steepening? must he not have been steepening? must we not have been steepening? must you not have been steepening? must they not have been steepening?