past tense of debate is debated.

Has been checked which tense?

The past tense of check is checked. The third-person singular simple present indicative form of check is checks. The present participle of check is checking. The past participle of check is checked.

Which tense is it has been?

The present perfect continuous is formed with have/has been and the -ing form of the verb. We normally use the present perfect continuous to emphasise that something is still continuing in the present: She has been living in Liverpool all her life.