English verb conjugation MUST TIGHTEN

Regular verb: tighten - tightened - tightened

Affirmation

Simple form

I must tighten
you must tighten
she must tighten
we must tighten
you must tighten
they must tighten

V-ing form

I must be tightening
you must be tightening
she must be tightening
we must be tightening
you must be tightening
they must be tightening

Perfect

I must have tightened
you must have tightened
she must have tightened
we must have tightened
you must have tightened
they must have tightened

V-ing perfect

I must have been tightening
you must have been tightening
she must have been tightening
we must have been tightening
you must have been tightening
they must have been tightening

Negation

Simple form

I mustn't tighten
you mustn't tighten
she mustn't tighten
we mustn't tighten
you mustn't tighten
they mustn't tighten

V-ing form

I mustn't be tightening
you mustn't be tightening
she mustn't be tightening
we mustn't be tightening
you mustn't be tightening
they mustn't be tightening

Perfect

I mustn't have tightened
you mustn't have tightened
she mustn't have tightened
we mustn't have tightened
you mustn't have tightened
they mustn't have tightened

V-ing perfect

I mustn't have been tightening
you mustn't have been tightening
she mustn't have been tightening
we mustn't have been tightening
you mustn't have been tightening
they mustn't have been tightening

Interrogative form

Simple form

must I tighten?
must you tighten?
must she tighten?
must we tighten?
must you tighten?
must they tighten?

V-ing form

must I be tightening?
must you be tightening?
must she be tightening?
must we be tightening?
must you be tightening?
must they be tightening?

Perfect

must I have tightened?
must you have tightened?
must she have tightened?
must we have tightened?
must you have tightened?
must they have tightened?

V-ing perfect

must I have been tightening?
must you have been tightening?
must she have been tightening?
must we have been tightening?
must you have been tightening?
must they have been tightening?

Interro-negative form

Simple form

mustn't I tighten?
mustn't you tighten?
mustn't she tighten?
mustn't we tighten?
mustn't you tighten?
mustn't they tighten?

V-ing form

mustn't I be tightening?
mustn't you be tightening?
mustn't she be tightening?
mustn't we be tightening?
mustn't you be tightening?
mustn't they be tightening?

Perfect

mustn't I have tightened?
mustn't you have tightened?
mustn't she have tightened?
mustn't we have tightened?
mustn't you have tightened?
mustn't they have tightened?

V-ing perfect

mustn't I have been tightening?
mustn't you have been tightening?
mustn't she have been tightening?
mustn't we have been tightening?
mustn't you have been tightening?
mustn't they have been tightening?

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