English verb conjugation MUST OBSERVE

Regular verb: observe - observed - observed

Affirmation

Simple form

I must observe
you must observe
he must observe
we must observe
you must observe
they must observe

V-ing form

I must be observing
you must be observing
he must be observing
we must be observing
you must be observing
they must be observing

Perfect

I must have observed
you must have observed
he must have observed
we must have observed
you must have observed
they must have observed

V-ing perfect

I must have been observing
you must have been observing
he must have been observing
we must have been observing
you must have been observing
they must have been observing

Negation

Simple form

I must not observe
you must not observe
he must not observe
we must not observe
you must not observe
they must not observe

V-ing form

I must not be observing
you must not be observing
he must not be observing
we must not be observing
you must not be observing
they must not be observing

Perfect

I must not have observed
you must not have observed
he must not have observed
we must not have observed
you must not have observed
they must not have observed

V-ing perfect

I must not have been observing
you must not have been observing
he must not have been observing
we must not have been observing
you must not have been observing
they must not have been observing

Interrogative form

Simple form

must I observe?
must you observe?
must he observe?
must we observe?
must you observe?
must they observe?

V-ing form

must I be observing?
must you be observing?
must he be observing?
must we be observing?
must you be observing?
must they be observing?

Perfect

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

V-ing perfect

must I have been observing?
must you have been observing?
must he have been observing?
must we have been observing?
must you have been observing?
must they have been observing?

Interro-negative form

Simple form

must I not observe?
must you not observe?
must he not observe?
must we not observe?
must you not observe?
must they not observe?

V-ing form

must I not be observing?
must you not be observing?
must he not be observing?
must we not be observing?
must you not be observing?
must they not be observing?

Perfect

must I not have observed?
must you not have observed?
must he not have observed?
must we not have observed?
must you not have observed?
must they not have observed?

V-ing perfect

must I not have been observing?
must you not have been observing?
must he not have been observing?
must we not have been observing?
must you not have been observing?
must they not have been observing?

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