English verb conjugation MUST STRENGTHEN

Regular verb: strengthen - strengthened - strengthened

Affirmation

Simple form

I must strengthen
you must strengthen
he must strengthen
we must strengthen
you must strengthen
they must strengthen

V-ing form

I must be strengthening
you must be strengthening
he must be strengthening
we must be strengthening
you must be strengthening
they must be strengthening

Perfect

I must have strengthened
you must have strengthened
he must have strengthened
we must have strengthened
you must have strengthened
they must have strengthened

V-ing perfect

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

Negation

Simple form

I must not strengthen
you must not strengthen
he must not strengthen
we must not strengthen
you must not strengthen
they must not strengthen

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I strengthen?
must you strengthen?
must he strengthen?
must we strengthen?
must you strengthen?
must they strengthen?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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