Exercise 5. Write a, an. 1 a …… book. 7 ……….. organization 13 …………. question
2 an… old book 8 ……….. restaurant 14 …….important question
3 …….. window 9 ……….. Chinese restaurant 15 ……….. hamburger
4 ……… horse 10 ……. Indian restaurant 16 ………. hour
5 …….. airport 11 ……….. accident 17 ……….. economic problem
6 ………university 12 ………bad accident 18 ……….nice evening

Exercise 5. Write a, an.

1 a …… book. 7 ……an….. organization 13 ……a……. question

2 an… old book 8 ……a….. restaurant 14 …an….important question

3 …a….. window 9 ……a….. Chinese restaurant 15 ……a….. hamburger

4 …a…… horse 10 …an…. Indian restaurant 16 …an……. hour

5 …an….. airport 11 ……an….. accident 17 ……an. economic problem

6 ……a…university 12 …a……bad accident 18 ……a….nice evening

Exercise 5. Write a, an.

1. a book.
Explanation: Since the word "book" starts with a consonant sound (pronounced as "b"), we use the article "a" before it.

2. an old book.
Explanation: The word "old" starts with a vowel sound (pronounced as "ow"), so we use the article "an" before it.

3. a window.
Explanation: The word "window" starts with a consonant sound (pronounced as "w"), so we use the article "a" before it.

4. a horse.
Explanation: The word "horse" starts with a consonant sound (pronounced as "h"), so we use the article "a" before it.

5. an airport.
Explanation: The word "airport" starts with a vowel sound (pronounced as "ey"), so we use the article "an" before it.

6. a university.
Explanation: The word "university" starts with a consonant sound (pronounced as "y"), so we use the article "a" before it.

7. an organization.
Explanation: The word "organization" starts with a vowel sound (pronounced as "oh"), so we use the article "an" before it.

8. a restaurant.
Explanation: The word "restaurant" starts with a consonant sound (pronounced as "r"), so we use the article "a" before it.

9. a Chinese restaurant.
Explanation: The phrase "Chinese restaurant" starts with a consonant sound (pronounced as "ch"), so we use the article "a" before it.

10. an Indian restaurant.
Explanation: The phrase "Indian restaurant" starts with a vowel sound (pronounced as "in"), so we use the article "an" before it.

11. an accident.
Explanation: The word "accident" starts with a vowel sound (pronounced as "uh"), so we use the article "an" before it.

12. a bad accident.
Explanation: The phrase "bad accident" starts with a consonant sound (pronounced as "b"), so we use the article "a" before it.

13. a question.
Explanation: The word "question" starts with a consonant sound (pronounced as "k"), so we use the article "a" before it.

14. an important question.
Explanation: The phrase "important question" starts with a vowel sound (pronounced as "im"), so we use the article "an" before it.

15. a hamburger.
Explanation: The word "hamburger" starts with a consonant sound (pronounced as "h"), so we use the article "a" before it.

16. an hour.
Explanation: The word "hour" starts with a vowel sound (pronounced as "ow"), so we use the article "an" before it.

17. an economic problem.
Explanation: The phrase "economic problem" starts with a vowel sound (pronounced as "i"), so we use the article "an" before it.

18. a nice evening.
Explanation: The phrase "nice evening" starts with a consonant sound (pronounced as "n"), so we use the article "a" before it.

In English, we use "a" before words that start with consonant sounds and "an" before words that start with vowel sounds. This helps us to use the correct article and make our sentences grammatically correct.