The Past Perfect Progressive tense in Tamil grammar, also known as the ‘Piragasaththikkum mudiviya aakiravikkai’, is used to emphasize the ongoing nature of an action that happened and continued before another took place in the past. This tense is formed by using ‘Piragasaththikkum’ (had been) with the root verb, ending with ‘- kkirathu’. Now, let’s practice with some exercises to understand and use this tense better.