Answer: "We're going to the beach this weekend."
Explanation: In this sentence, "we're" is a contraction of "we" and "are." The contraction replaces the word "are" with an apostrophe to create a more informal and conversational tone. Contractions are commonly used in spoken English, informal writing, and dialogue to make language sound more natural and flowing. However, they should be used appropriately and sparingly in formal writing or academic contexts.