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 mustn't obscure you mustn't obscure he mustn't obscure we mustn't obscure you mustn't obscure they mustn't obscure	I mustn't be obscuring you mustn't be obscuring he mustn't be obscuring we mustn't be obscuring you mustn't be obscuring they mustn't be obscuring
Perfect	V-ing perfect
I mustn't have obscured you mustn't have obscured he mustn't have obscured we mustn't have obscured you mustn't have obscured they mustn't have obscured	I mustn't have been obscuring you mustn't have been obscuring he mustn't have been obscuring we mustn't have been obscuring you mustn't have been obscuring they mustn't 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
mustn't I obscure? mustn't you obscure? mustn't he obscure? mustn't we obscure? mustn't you obscure? mustn't they obscure?	mustn't I be obscuring? mustn't you be obscuring? mustn't he be obscuring? mustn't we be obscuring? mustn't you be obscuring? mustn't they be obscuring?
Perfect	V-ing perfect
mustn't I have obscured? mustn't you have obscured? mustn't he have obscured? mustn't we have obscured? mustn't you have obscured? mustn't they have obscured?	mustn't I have been obscuring? mustn't you have been obscuring? mustn't he have been obscuring? mustn't we have been obscuring? mustn't you have been obscuring? mustn't they have been obscuring?