English verb conjugation MUST OCCUR

Regular verb: occur - occurred - occurred

Affirmation

Simple form

I must occur
you must occur
she must occur
we must occur
you must occur
they must occur

V-ing form

I must be occurring
you must be occurring
she must be occurring
we must be occurring
you must be occurring
they must be occurring

Perfect

I must have occurred
you must have occurred
she must have occurred
we must have occurred
you must have occurred
they must have occurred

V-ing perfect

I must have been occurring
you must have been occurring
she must have been occurring
we must have been occurring
you must have been occurring
they must have been occurring

Negation

Simple form

I mustn't occur
you mustn't occur
she mustn't occur
we mustn't occur
you mustn't occur
they mustn't occur

V-ing form

I mustn't be occurring
you mustn't be occurring
she mustn't be occurring
we mustn't be occurring
you mustn't be occurring
they mustn't be occurring

Perfect

I mustn't have occurred
you mustn't have occurred
she mustn't have occurred
we mustn't have occurred
you mustn't have occurred
they mustn't have occurred

V-ing perfect

I mustn't have been occurring
you mustn't have been occurring
she mustn't have been occurring
we mustn't have been occurring
you mustn't have been occurring
they mustn't have been occurring

Interrogative form

Simple form

must I occur?
must you occur?
must she occur?
must we occur?
must you occur?
must they occur?

V-ing form

must I be occurring?
must you be occurring?
must she be occurring?
must we be occurring?
must you be occurring?
must they be occurring?

Perfect

must I have occurred?
must you have occurred?
must she have occurred?
must we have occurred?
must you have occurred?
must they have occurred?

V-ing perfect

must I have been occurring?
must you have been occurring?
must she have been occurring?
must we have been occurring?
must you have been occurring?
must they have been occurring?

Interro-negative form

Simple form

mustn't I occur?
mustn't you occur?
mustn't she occur?
mustn't we occur?
mustn't you occur?
mustn't they occur?

V-ing form

mustn't I be occurring?
mustn't you be occurring?
mustn't she be occurring?
mustn't we be occurring?
mustn't you be occurring?
mustn't they be occurring?

Perfect

mustn't I have occurred?
mustn't you have occurred?
mustn't she have occurred?
mustn't we have occurred?
mustn't you have occurred?
mustn't they have occurred?

V-ing perfect

mustn't I have been occurring?
mustn't you have been occurring?
mustn't she have been occurring?
mustn't we have been occurring?
mustn't you have been occurring?
mustn't they have been occurring?

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