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 must not preascertain
you must not preascertain
he must not preascertain
we must not preascertain
you must not preascertain
they must not preascertain

V-ing form

I must not be preascertaining
you must not be preascertaining
he must not be preascertaining
we must not be preascertaining
you must not be preascertaining
they must not be preascertaining

Perfect

I must not have preascertained
you must not have preascertained
he must not have preascertained
we must not have preascertained
you must not have preascertained
they must not have preascertained

V-ing perfect

I must not have been preascertaining
you must not have been preascertaining
he must not have been preascertaining
we must not have been preascertaining
you must not have been preascertaining
they must not 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

must I not preascertain?
must you not preascertain?
must he not preascertain?
must we not preascertain?
must you not preascertain?
must they not preascertain?

V-ing form

must I not be preascertaining?
must you not be preascertaining?
must he not be preascertaining?
must we not be preascertaining?
must you not be preascertaining?
must they not be preascertaining?

Perfect

must I not have preascertained?
must you not have preascertained?
must he not have preascertained?
must we not have preascertained?
must you not have preascertained?
must they not have preascertained?

V-ing perfect

must I not have been preascertaining?
must you not have been preascertaining?
must he not have been preascertaining?
must we not have been preascertaining?
must you not have been preascertaining?
must they not have been preascertaining?

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