Why do Korean students say 'I ate lunch' when they mean 'I've eaten lunch'?

Teacher Notes: Present Perfect vs. Simple Past

Answer Key

Part 1: Choose the correct tense

1. have eaten
2. ate
3. Have you ever been
4. Did you go
5. has lost
6. lost
7. have lived
8. lived
9. Have you finished
10. did you finish

Part 2: Fill in the blank

1. 's gone / has gone
2. went
3. 've seen / have seen
4. saw
5. haven't met
6. didn't meet
7. Have you ever eaten
8. did you eat
9. has studied / 's studied
10. studied

Part 3: Correct the mistakes

1. I saw him yesterday. (remove "have")
2. Have you ever been to Japan? (change "Did...been" to "Have...been")
3. She has lived here for five years. (add "for")
4. I bought this phone last year. (remove "have")
5. We haven't finished yet. (change "didn't" to "haven't")

Teaching Tips

Before the worksheet:

• Write two example sentences on the board: "I ate lunch" vs. "I've eaten lunch."
• Act out the difference: "Yesterday at noon, I ate lunch" (finished story) vs. "I've eaten lunch already" (still not hungry now).
• Emphasize: Present perfect = past action + present result/relevance.

During the worksheet:

• For Part 1, have students underline any time expressions first (yesterday, already, yet, etc.).
• For Part 2, pairs discuss their answers before whole-class review.
• For Part 3, students should explain WHY the original sentence was wrong.

Common student mistakes to expect:

• Saying "I have seen him yesterday" (overcorrection)
• Dropping "for" and "since": "I lived here three years"
• Mixing up "gone" vs. "been": "Have you gone to Japan?" when they mean "been"

Extension activity:

• Students write five sentences about their own lives: three using simple past (with specific times), two using present perfect (with "for," "since," "already," or "yet").
• Partners check each other's work.

Korean-specific reminder: Korean uses one past form (았/었) for both English tenses. Students aren't being careless—they're learning a grammatical distinction that doesn't exist in their L1. Be patient and correct consistently without frustration.