Which sentence is written in the past tense?

• A. She is walking to the store.
• B. She will walk to the store.
• C. She walks to the store.
• D. She walked to the store.

Answer: (D)

Past tense expresses actions that already happened. The form with walked is the past tense of walk, so “She walked to the store” shows a completed action in the past. The other sentences use present or future forms: “is walking” is present continuous, “will walk” is future, and “walks” is present simple for third person. So the sentence with walked is the one written in the past tense.