English verb conjugation
MUST OBSESS

Regular verb: obsess - obsessed - obsessed

Affirmation

Simple form	V-ing form
I must obsess you must obsess she must obsess we must obsess you must obsess they must obsess	I must be obsessing you must be obsessing she must be obsessing we must be obsessing you must be obsessing they must be obsessing
Perfect	V-ing perfect
I must have obsessed you must have obsessed she must have obsessed we must have obsessed you must have obsessed they must have obsessed	I must have been obsessing you must have been obsessing she must have been obsessing we must have been obsessing you must have been obsessing they must have been obsessing

Negation

Simple form	V-ing form
I must not obsess you must not obsess she must not obsess we must not obsess you must not obsess they must not obsess	I must not be obsessing you must not be obsessing she must not be obsessing we must not be obsessing you must not be obsessing they must not be obsessing
Perfect	V-ing perfect
I must not have obsessed you must not have obsessed she must not have obsessed we must not have obsessed you must not have obsessed they must not have obsessed	I must not have been obsessing you must not have been obsessing she must not have been obsessing we must not have been obsessing you must not have been obsessing they must not have been obsessing

Interrogative form

Simple form	V-ing form
must I obsess? must you obsess? must she obsess? must we obsess? must you obsess? must they obsess?	must I be obsessing? must you be obsessing? must she be obsessing? must we be obsessing? must you be obsessing? must they be obsessing?
Perfect	V-ing perfect
must I have obsessed? must you have obsessed? must she have obsessed? must we have obsessed? must you have obsessed? must they have obsessed?	must I have been obsessing? must you have been obsessing? must she have been obsessing? must we have been obsessing? must you have been obsessing? must they have been obsessing?

Interro-negative form

Simple form	V-ing form
must I not obsess? must you not obsess? must she not obsess? must we not obsess? must you not obsess? must they not obsess?	must I not be obsessing? must you not be obsessing? must she not be obsessing? must we not be obsessing? must you not be obsessing? must they not be obsessing?
Perfect	V-ing perfect
must I not have obsessed? must you not have obsessed? must she not have obsessed? must we not have obsessed? must you not have obsessed? must they not have obsessed?	must I not have been obsessing? must you not have been obsessing? must she not have been obsessing? must we not have been obsessing? must you not have been obsessing? must they not have been obsessing?