1. Which is the most effective sentence combination that uses correct punctuation? I lost my ring at the skating rink. The ring had been a gift from my grandmother. Which had been a gift, the ring from my grandmother, I lost at the skating rink. I lost my ring at the skating rink that had been a gift from my grandmother. I lost my ring at the skating rink, and the ring had been a gift from my grandmother. I lost my ring, which had been a gift from my grandmother, at the skating rink.

The question is asking for the most effective sentence combination that uses correct punctuation. The original sentences are: "I lost my ring at the skating rink." and "The ring had been a gift from my grandmother." The options provided are:<br /><br />1. "Which had been a gift, the ring from my grandmother, I lost at the skating rink." - This sentence is grammatically incorrect and awkwardly structured.<br /> <br />2. "I lost my ring at the skating rink that had been a gift from my grandmother." - This sentence is also grammatically incorrect. It implies that the skating rink had been a gift from the grandmother, which is not the intended meaning.<br /><br />3. "I lost my ring at the skating rink, and the ring had been a gift from my grandmother." - This sentence is grammatically correct but is awkward and repetitive.<br /><br />4. "I lost my ring, which had been a gift from my grandmother, at the skating rink." - This sentence is grammatically correct and effectively combines the two original sentences into one coherent statement.<br /><br />Therefore, the most effective sentence combination that uses correct punctuation is "I lost my ring, which had been a gift from my grandmother, at the skating rink."