English verb conjugation
MUST OBSCURE

Regular verb: obscure - obscured - obscured

Affirmation

Simple form	V-ing form
I must obscure you must obscure he must obscure we must obscure you must obscure they must obscure	I must be obscuring you must be obscuring he must be obscuring we must be obscuring you must be obscuring they must be obscuring
Perfect	V-ing perfect
I must have obscured you must have obscured he must have obscured we must have obscured you must have obscured they must have obscured	I must have been obscuring you must have been obscuring he must have been obscuring we must have been obscuring you must have been obscuring they must have been obscuring

Negation

Simple form	V-ing form
I must not obscure you must not obscure he must not obscure we must not obscure you must not obscure they must not obscure	I must not be obscuring you must not be obscuring he must not be obscuring we must not be obscuring you must not be obscuring they must not be obscuring
Perfect	V-ing perfect
I must not have obscured you must not have obscured he must not have obscured we must not have obscured you must not have obscured they must not have obscured	I must not have been obscuring you must not have been obscuring he must not have been obscuring we must not have been obscuring you must not have been obscuring they must not have been obscuring

Interrogative form

Simple form	V-ing form
must I obscure? must you obscure? must he obscure? must we obscure? must you obscure? must they obscure?	must I be obscuring? must you be obscuring? must he be obscuring? must we be obscuring? must you be obscuring? must they be obscuring?
Perfect	V-ing perfect
must I have obscured? must you have obscured? must he have obscured? must we have obscured? must you have obscured? must they have obscured?	must I have been obscuring? must you have been obscuring? must he have been obscuring? must we have been obscuring? must you have been obscuring? must they have been obscuring?

Interro-negative form

Simple form	V-ing form
must I not obscure? must you not obscure? must he not obscure? must we not obscure? must you not obscure? must they not obscure?	must I not be obscuring? must you not be obscuring? must he not be obscuring? must we not be obscuring? must you not be obscuring? must they not be obscuring?
Perfect	V-ing perfect
must I not have obscured? must you not have obscured? must he not have obscured? must we not have obscured? must you not have obscured? must they not have obscured?	must I not have been obscuring? must you not have been obscuring? must he not have been obscuring? must we not have been obscuring? must you not have been obscuring? must they not have been obscuring?