Correct the sentences with suitable capital letters and punctuation marks.

To solve the problem, we need to correct the sentences by applying proper capitalization and punctuation rules. Here is the corrected version of each sentence with explanations:

---

Corrected Sentences:

1. Original: we took a lesson in german and translated it into english
Corrected: We took a lesson in German and translated it into English.
Explanation: Capitalize the first word of the sentence ("We"), proper nouns ("German," "English").

2. Original: ali lives in dubai, the united arab emirates
Corrected: Ali lives in Dubai, the United Arab Emirates.
Explanation: Capitalize the first word of the sentence ("Ali"), proper nouns ("Dubai," "United Arab Emirates").

3. Original: these pictures were taken during our holiday in california, usa
Corrected: These pictures were taken during our holiday in California, USA.
Explanation: Capitalize the first word of the sentence ("These"), proper nouns ("California," "USA").

4. Original: on saturday and sunday,i am going to the metro centre in newcastle
Corrected: On Saturday and Sunday, I am going to the Metro Centre in Newcastle.
Explanation: Capitalize days of the week ("Saturday," "Sunday"), the pronoun "I," and proper nouns ("Metro Centre," "Newcastle"). Add a comma after "Sunday" for clarity.

5. Original: how long did you study for the test
Corrected: How long did you study for the test?
Explanation: Capitalize the first word of the sentence ("How") and add a question mark at the end.

6. Original: i like to take my children to albert park
Corrected: I like to take my children to Albert Park.
Explanation: Capitalize the first word of the sentence ("I") and the proper noun ("Albert Park").

7. Original: did ramadan start on thursday
Corrected: Did Ramadan start on Thursday?
Explanation: Capitalize the first word of the sentence ("Did"), the proper noun ("Ramadan"), and the day of the week ("Thursday"). Add a question mark at the end.

8. Original: huda watched the news on the bbc
Corrected: Huda watched the news on the BBC.
Explanation: Capitalize the first word of the sentence ("Huda") and the acronym "BBC."

9. Original: i think june is the longest month
Corrected: I think June is the longest month.
Explanation: Capitalize the first word of the sentence ("I") and the month name ("June").

10. Original: muslims read the quran while the christians read the bible
Corrected: Muslims read the Quran while Christians read the Bible.
Explanation: Capitalize the first letter of proper nouns ("Muslims," "Quran," "Christians," "Bible").

11. Original: my mother is called ann and my father is called tom
Corrected: My mother is called Ann and my father is called Tom.
Explanation: Capitalize the first word of the sentence ("My") and names ("Ann," "Tom").

12. Original: i am going to sheffirld to visit my friend mary
Corrected: I am going to Sheffield to visit my friend Mary.
Explanation: Capitalize the first word of the sentence ("I"), the city name ("Sheffield"), and the name ("Mary").

13. Original: there is a new post office opening on monday,12th of september
Corrected: There is a new post office opening on Monday, 12th of September.
Explanation: Capitalize the first word of the sentence ("There"), the day of the week ("Monday"), and the month name ("September"). Add a space after the comma.

14. Original: this train to london stops in manchester
Corrected: This train to London stops in Manchester.
Explanation: Capitalize the first word of the sentence ("This"), proper nouns ("London," "Manchester").

15. Original: what time do we meet on marton road
Corrected: What time do we meet on Marton Road?
Explanation: Capitalize the first word of the sentence ("What") and the proper noun ("Marton Road"). Add a question mark at the end.

16. Original: in the holiday, my family and i are going to paris on the eurostar
Corrected: In the holiday, my family and I are going to Paris on the Eurostar.
Explanation: Capitalize the pronoun "I," the city name ("Paris"), and the proper noun ("Eurostar").

17. Original: i live on olive street near the city centre
Corrected: I live on Olive Street near the city centre.
Explanation: Capitalize the first word of the sentence ("I") and the street name ("Olive Street").

18. Original: is there a medical centre near here
Corrected: Is there a medical centre near here?
Explanation: Capitalize the first word of the sentence ("Is") and add a question mark at the end.

---

Final Answer:

\boxed{
\begin{aligned}
1. & \text{ We took a lesson in German and translated it into English.} \\
2. & \text{ Ali lives in Dubai, the United Arab Emirates.} \\
3. & \text{ These pictures were taken during our holiday in California, USA.} \\
4. & \text{ On Saturday and Sunday, I am going to the Metro Centre in Newcastle.} \\
5. & \text{ How long did you study for the test?} \\
6. & \text{ I like to take my children to Albert Park.} \\
7. & \text{ Did Ramadan start on Thursday?} \\
8. & \text{ Huda watched the news on the BBC.} \\
9. & \text{ I think June is the longest month.} \\
10. & \text{ Muslims read the Quran while Christians read the Bible.} \\
11. & \text{ My mother is called Ann and my father is called Tom.} \\
12. & \text{ I am going to Sheffield to visit my friend Mary.} \\
13. & \text{ There is a new post office opening on Monday, 12th of September.} \\
14. & \text{ This train to London stops in Manchester.} \\
15. & \text{ What time do we meet on Marton Road?} \\
16. & \text{ In the holiday, my family and I are going to Paris on the Eurostar.} \\
17. & \text{ I live on Olive Street near the city centre.} \\
18. & \text{ Is there a medical centre near here?} \\
\end{aligned}
}