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Indicative

Present Simple
Perfect Simple
Past Simple
Pluperfect Simple
Future Simple
Future perfect Simple
Present Continuous
Perfect Continuous
Past Continuous
Pluperfect Continuous
Future Continuous
Future perfect Continuous
I ascertain
you ascertain
he/she/it ascertains
we ascertain
they ascertain
I have ascertained
you have ascertained
he/she/it has ascertained
we have ascertained
they have ascertained
I ascertained
you ascertained
he/she/it ascertained
we ascertained
they ascertained
I had ascertained
you had ascertained
he/she/it had ascertained
we had ascertained
they had ascertained
I will ascertain
you will ascertain
he/she/it will ascertain
we will ascertain
they will ascertain
I will have ascertained
you will have ascertained
he/she/it will have ascertained
we will have ascertained
they will have ascertained
I am ascertaining
you are ascertaining
he/she/it is ascertaining
we are ascertaining
they are ascertaining
I have been ascertaining
you have been ascertaining
he/she/it has been ascertaining
we have been ascertaining
they have been ascertaining
I was ascertaining
you were ascertaining
he/she/it was ascertaining
we were ascertaining
they were ascertaining
I had been ascertaining
you had been ascertaining
he/she/it had been ascertaining
we had been ascertaining
they had been ascertaining
I will be ascertaining
you will be ascertaining
he/she/it will be ascertaining
we will be ascertaining
they will be ascertaining
I will have been ascertaining
you will have been ascertaining
he/she/it will have been ascertaining
we will have been ascertaining
they will have been ascertaining

Subjunctive

Present Simple
Perfect Simple
Imperfect Simple
Pluperfect Simple
I ascertain
you ascertain
he/she/it ascertain
we ascertain
they ascertain
I have ascertained
you have ascertained
he/she/it have ascertained
we have ascertained
they have ascertained
I ascertained
you ascertained
he/she/it ascertained
we ascertained
they ascertained
I had ascertained
you had ascertained
he/she/it had ascertained
we had ascertained
they had ascertained

Conditional

Present Simple
Perfect Simple
Present Continuous
Perfect Continuous
I would ascertain
you would ascertain
he/she/it would ascertain
we would ascertain
they would ascertain
I would have ascertained
you would have ascertained
he/she/it would have ascertained
we would have ascertained
they would have ascertained
I would be ascertaining
you would be ascertaining
he/she/it would be ascertaining
we would be ascertaining
they would be ascertaining
I would have been ascertaining
you would have been ascertaining
he/she/it would have been ascertaining
we would have been ascertaining
they would have been ascertaining

Imperative

you ascertain
we Let's ascertain

← Conjugate another English verb

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