Which is a complete sentence?

**The reasoning** A complete sentence needs **two essential parts**: a subject (who/what) and a predicate with a complete verb (what they do). It must express a complete thought that can stand alone. Let's check each: - **Option B: "She runs fast."** ✓ Subject = "She" | Complete verb = "runs" | Complete thought = Yes! This tells us everything we need to know. **Why the wrong options tempt you** - **A) "Running fast"** has action but no subject. *Who* is running? It's a phrase hanging in the air. - **C) "Because she runs"** starts with "because," which makes us wait for more information. Because she runs... *what happens?* Incomplete thought. - **D) "To run fast"** is an infinitive phrase. It describes an action but doesn't tell us who performs it or when it happens. These fragments *look* like sentences because they contain verbs or action words, but they can't stand alone. **Quick takeaway** A complete sentence = **Someone/Something + Does something + Complete thought.** If you're left asking "So what?" or "Who?", it's not complete!