English verb conjugation
MUST OBSESS

Regular verb: obsess - obsessed - obsessed

Affirmation

Simple form	V-ing form
I must obsess you must obsess he must obsess we must obsess you must obsess they must obsess	I must be obsessing you must be obsessing he 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 he 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 he 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 mustn't obsess you mustn't obsess he mustn't obsess we mustn't obsess you mustn't obsess they mustn't obsess	I mustn't be obsessing you mustn't be obsessing he mustn't be obsessing we mustn't be obsessing you mustn't be obsessing they mustn't be obsessing
Perfect	V-ing perfect
I mustn't have obsessed you mustn't have obsessed he mustn't have obsessed we mustn't have obsessed you mustn't have obsessed they mustn't have obsessed	I mustn't have been obsessing you mustn't have been obsessing he mustn't have been obsessing we mustn't have been obsessing you mustn't have been obsessing they mustn't have been obsessing

Interrogative form

Simple form	V-ing form
must I obsess? must you obsess? must he obsess? must we obsess? must you obsess? must they obsess?	must I be obsessing? must you be obsessing? must he 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 he 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 he 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
mustn't I obsess? mustn't you obsess? mustn't he obsess? mustn't we obsess? mustn't you obsess? mustn't they obsess?	mustn't I be obsessing? mustn't you be obsessing? mustn't he be obsessing? mustn't we be obsessing? mustn't you be obsessing? mustn't they be obsessing?
Perfect	V-ing perfect
mustn't I have obsessed? mustn't you have obsessed? mustn't he have obsessed? mustn't we have obsessed? mustn't you have obsessed? mustn't they have obsessed?	mustn't I have been obsessing? mustn't you have been obsessing? mustn't he have been obsessing? mustn't we have been obsessing? mustn't you have been obsessing? mustn't they have been obsessing?