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 cannot ascertain
you cannot ascertain
he cannot ascertain
we cannot ascertain
you cannot ascertain
they cannot ascertain

V-ing form

I cannot be ascertaining
you cannot be ascertaining
he cannot be ascertaining
we cannot be ascertaining
you cannot be ascertaining
they cannot be ascertaining

Perfect

I cannot have ascertained
you cannot have ascertained
he cannot have ascertained
we cannot have ascertained
you cannot have ascertained
they cannot have ascertained

V-ing perfect

I cannot have been ascertaining
you cannot have been ascertaining
he cannot have been ascertaining
we cannot have been ascertaining
you cannot have been ascertaining
they cannot 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 I not ascertain?
can you not ascertain?
can he not ascertain?
can we not ascertain?
can you not ascertain?
can they not ascertain?

V-ing form

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

Perfect

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

V-ing perfect

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

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