English verb conjugation MUST FASTEN

Regular verb: fasten - fastened - fastened


Affirmation

Simple form

I must fasten
you must fasten
he must fasten
we must fasten
you must fasten
they must fasten

V-ing form

I must be fastening
you must be fastening
he must be fastening
we must be fastening
you must be fastening
they must be fastening

Perfect

I must have fastened
you must have fastened
he must have fastened
we must have fastened
you must have fastened
they must have fastened

V-ing perfect

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

Negation

Simple form

I must not fasten
you must not fasten
he must not fasten
we must not fasten
you must not fasten
they must not fasten

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I fasten?
must you fasten?
must he fasten?
must we fasten?
must you fasten?
must they fasten?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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