English verb conjugation MUST OBSESS

Regular verb: obsess - obsessed - obsessed

Affirmation

Simple form

I must obsess
you must obsess
he must obsess
we must obsess
you must obsess
they must obsess

V-ing form

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

I must have obsessed
you must have obsessed
he must have obsessed
we must have obsessed
you must have obsessed
they must have obsessed

V-ing perfect

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

I mustn't obsess
you mustn't obsess
he mustn't obsess
we mustn't obsess
you mustn't obsess
they mustn't obsess

V-ing form

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

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

V-ing perfect

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

must I obsess?
must you obsess?
must he obsess?
must we obsess?
must you obsess?
must they obsess?

V-ing form

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

must I have obsessed?
must you have obsessed?
must he have obsessed?
must we have obsessed?
must you have obsessed?
must they have obsessed?

V-ing perfect

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

mustn't I obsess?
mustn't you obsess?
mustn't he obsess?
mustn't we obsess?
mustn't you obsess?
mustn't they obsess?

V-ing form

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

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?

V-ing perfect

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?

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