English verb conjugation MUST BUTTRESS

Regular verb: buttress - buttressed - buttressed

Affirmation

Simple form

I must buttress
you must buttress
he must buttress
we must buttress
you must buttress
they must buttress

V-ing form

I must be buttressing
you must be buttressing
he must be buttressing
we must be buttressing
you must be buttressing
they must be buttressing

Perfect

I must have buttressed
you must have buttressed
he must have buttressed
we must have buttressed
you must have buttressed
they must have buttressed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I buttress?
must you buttress?
must he buttress?
must we buttress?
must you buttress?
must they buttress?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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