English verb conjugation CAN ASCERTAIN

Regular verb: ascertain - ascertained - ascertained

Affirmation

Simple form

I can ascertain
you can ascertain
he can ascertain
we can ascertain
you can ascertain
they can ascertain

V-ing form

I can be ascertaining
you can be ascertaining
he can be ascertaining
we can be ascertaining
you can be ascertaining
they can be ascertaining

Perfect

I can have ascertained
you can have ascertained
he can have ascertained
we can have ascertained
you can have ascertained
they can have ascertained

V-ing perfect

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

Negation

Simple form

I can't ascertain
you can't ascertain
he can't ascertain
we can't ascertain
you can't ascertain
they can't ascertain

V-ing form

I can't be ascertaining
you can't be ascertaining
he can't be ascertaining
we can't be ascertaining
you can't be ascertaining
they can't be ascertaining

Perfect

I can't have ascertained
you can't have ascertained
he can't have ascertained
we can't have ascertained
you can't have ascertained
they can't have ascertained

V-ing perfect

I can't have been ascertaining
you can't have been ascertaining
he can't have been ascertaining
we can't have been ascertaining
you can't have been ascertaining
they can't have been ascertaining

Interrogative form

Simple form

can I ascertain?
can you ascertain?
can he ascertain?
can we ascertain?
can you ascertain?
can they ascertain?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

can't I ascertain?
can't you ascertain?
can't he ascertain?
can't we ascertain?
can't you ascertain?
can't they ascertain?

V-ing form

can't I be ascertaining?
can't you be ascertaining?
can't he be ascertaining?
can't we be ascertaining?
can't you be ascertaining?
can't they be ascertaining?

Perfect

can't I have ascertained?
can't you have ascertained?
can't he have ascertained?
can't we have ascertained?
can't you have ascertained?
can't they have ascertained?

V-ing perfect

can't I have been ascertaining?
can't you have been ascertaining?
can't he have been ascertaining?
can't we have been ascertaining?
can't you have been ascertaining?
can't they have been ascertaining?

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