English verb conjugation MUST LENGTHEN

Regular verb: lengthen - lengthened - lengthened

Affirmation

Simple form

I must lengthen
you must lengthen
he must lengthen
we must lengthen
you must lengthen
they must lengthen

V-ing form

I must be lengthening
you must be lengthening
he must be lengthening
we must be lengthening
you must be lengthening
they must be lengthening

Perfect

I must have lengthened
you must have lengthened
he must have lengthened
we must have lengthened
you must have lengthened
they must have lengthened

V-ing perfect

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

Negation

Simple form

I mustn't lengthen
you mustn't lengthen
he mustn't lengthen
we mustn't lengthen
you mustn't lengthen
they mustn't lengthen

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I lengthen?
must you lengthen?
must he lengthen?
must we lengthen?
must you lengthen?
must they lengthen?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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