English verb conjugation MUST SIEVE

Regular verb: sieve - sieved - sieved

Affirmation

Simple form

I must sieve
you must sieve
he must sieve
we must sieve
you must sieve
they must sieve

V-ing form

I must be sieving
you must be sieving
he must be sieving
we must be sieving
you must be sieving
they must be sieving

Perfect

I must have sieved
you must have sieved
he must have sieved
we must have sieved
you must have sieved
they must have sieved

V-ing perfect

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

Negation

Simple form

I must not sieve
you must not sieve
he must not sieve
we must not sieve
you must not sieve
they must not sieve

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I sieve?
must you sieve?
must he sieve?
must we sieve?
must you sieve?
must they sieve?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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