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 mustn't strengthen
you mustn't strengthen
he mustn't strengthen
we mustn't strengthen
you mustn't strengthen
they mustn't strengthen

V-ing form

I mustn't be strengthening
you mustn't be strengthening
he mustn't be strengthening
we mustn't be strengthening
you mustn't be strengthening
they mustn't be strengthening

Perfect

I mustn't have strengthened
you mustn't have strengthened
he mustn't have strengthened
we mustn't have strengthened
you mustn't have strengthened
they mustn't have strengthened

V-ing perfect

I mustn't have been strengthening
you mustn't have been strengthening
he mustn't have been strengthening
we mustn't have been strengthening
you mustn't have been strengthening
they mustn't 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

mustn't I strengthen?
mustn't you strengthen?
mustn't he strengthen?
mustn't we strengthen?
mustn't you strengthen?
mustn't they strengthen?

V-ing form

mustn't I be strengthening?
mustn't you be strengthening?
mustn't he be strengthening?
mustn't we be strengthening?
mustn't you be strengthening?
mustn't they be strengthening?

Perfect

mustn't I have strengthened?
mustn't you have strengthened?
mustn't he have strengthened?
mustn't we have strengthened?
mustn't you have strengthened?
mustn't they have strengthened?

V-ing perfect

mustn't I have been strengthening?
mustn't you have been strengthening?
mustn't he have been strengthening?
mustn't we have been strengthening?
mustn't you have been strengthening?
mustn't they have been strengthening?

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