diff --git a/README.md b/README.md
index 69709be0e4d56339008305ab056baebd63be57ae..628c341293ff6db0c7994bda40ae12086f73fdb8 100644
--- a/README.md
+++ b/README.md
@@ -8,23 +8,23 @@ This is a hands-on tutorial on how to learn git.
 * [The `python_test_tutorial` repository](https://gitlab.utu.fi/matros/python_test_tutorial)
 
 ## Find the mistakes
-1. It is raining when I got home last night.
+1. It was raining when I got home last night.
 2. My sister is annoying today, but usually she is nice.
-3. I have not ate anything today.
+3. I have not eaten anything today.
 4. If I am a child, I would play outside.
-5. Everyone have seen that movie.
+5. Everyone has seen that movie.
 6. If we will be late, they will be angry.
 7. My father is thinking that I should stop smoking.
-8. Look! It is snow.
+8. Look! It is snowing.
 9. I fell asleep while I watched TV.
 10. I have lived in Canada since 10 months.
 11. There is a warm country.
-12. I have not an iPhone.
+12. I have an iPhone.
 13. I haven’t ever been to Korea.
 14. The students have a good time in class today.
 15. John probably isn’t going to come to school tomorrow.
 16. If the world ended tomorrow, I will be very sad.
 17. I still did my homework at 10:30 pm last night.
 18. He can speak Japanese because he was born in Canada.
-19. Lee afraid of snakes.
-20. The students were not interested in the lesson because it was bored.
+19. Lee is afraid of snakes.
+20. The students were not interested in the lesson because they were bored.