English verb conjugation MUST ASCERTAIN

Regular verb: ascertain - ascertained - ascertained

Affirmation

Simple form

I must ascertain
you must ascertain
he must ascertain
we must ascertain
you must ascertain
they must ascertain

V-ing form

I must be ascertaining
you must be ascertaining
he must be ascertaining
we must be ascertaining
you must be ascertaining
they must be ascertaining

Perfect

I must have ascertained
you must have ascertained
he must have ascertained
we must have ascertained
you must have ascertained
they must have ascertained

V-ing perfect

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

Negation

Simple form

I must not ascertain
you must not ascertain
he must not ascertain
we must not ascertain
you must not ascertain
they must not ascertain

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I ascertain?
must you ascertain?
must he ascertain?
must we ascertain?
must you ascertain?
must they ascertain?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Page top