English verb conjugation MUST PREASCERTAIN

Regular verb: preascertain - preascertained - preascertained

Affirmation

Simple form

I must preascertain
you must preascertain
he must preascertain
we must preascertain
you must preascertain
they must preascertain

V-ing form

I must be preascertaining
you must be preascertaining
he must be preascertaining
we must be preascertaining
you must be preascertaining
they must be preascertaining

Perfect

I must have preascertained
you must have preascertained
he must have preascertained
we must have preascertained
you must have preascertained
they must have preascertained

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I preascertain?
must you preascertain?
must he preascertain?
must we preascertain?
must you preascertain?
must they preascertain?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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