1. Error type: Missing punctuation. Correct version: Algebra is an area of study in mathematics. Geometry is another branch. 2. Error type: Incorrect verb form. Correct version: The exam includes several parts. We are expected to attempt all of them. 3. Error type: Pronoun-antecedent agreement. Correct version: Although his family advised against it, he insisted on marrying the woman. 4. Error type: Misplaced modifier. Correct version: While studying very hard, I was disturbed by the loud music from the next door. 5. Error type: Preposition use. Correct version: Helen found it very difficult to mount the horse while wearing tight jeans. 6. Error type: Missing article. Correct version: I saw a shoe in a magazine that cost $5000. 7. Error type: Agreement error. Correct version: Walking through the town at night, I saw several bar ladies on the streets. 8. Error type: Missing verb. Correct version: Neil Armstrong was the first human to walk on the moon. This event occurred in 1969. 9. Error type: Incorrect article use. Correct version: Although she prepared delicious "doro wot". 10. Error type: Missing verb. Correct version: The early bus to Addis leaves the station at one o'clock in the morning.