You had participated - is it right grammar?

The grammar is technically correct, but it sounds awkward and is not the most natural way to phrase it.

Here's why it sounds awkward:

* Passive Voice: The sentence is in the passive voice ("had participated"). This is often less clear and direct than the active voice.

* Lack of Context: We don't know *who* participated in what. This lack of context makes the sentence feel incomplete.

Here are some better ways to phrase it:

* Active Voice: "You participated..."

* Adding Context: "You had participated in the competition..."

* More Specific: "You had participated in the debate earlier that day..."

The best choice will depend on the specific context of your sentence.