English grammar worksheet focusing on the use of articles "a," "an," "the," and no article, designed for practice and learning.

Let's solve this exercise step by step. The goal is to fill in the blanks with a, an, the, or no article (i.e., leave blank) based on English grammar rules for articles.

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🔹 Rules Recap:

- "a" / "an": Used for non-specific, singular countable nouns.
- Use "a" before consonant sounds.
- Use "an" before vowel sounds.
- "the": Used for specific nouns (already known or previously mentioned).
- No article: Used with uncountable nouns, plural nouns, or when referring to things in general.

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Now, let’s go through each sentence:

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1. "Where is _________ pen you borrowed from me yesterday?"
→ The pen is specific (the one borrowed).
✔ Answer: the

2. There is a blue shirt on sale. Unfortunately, _________ shirt is not my size.
→ Refers back to the previously mentioned shirt (specific).
✔ Answer: the

3. "I need _________ new desk for my work."
→ Not a specific desk; any new desk will do. "New" starts with a consonant sound.
✔ Answer: a

4. Mike has _________ old bike. His bike doesn't ride well.
→ General reference to a bike (not specific), "old" starts with a vowel sound? Wait — "old" begins with a vowel sound (/əʊld/ → /oʊld/, but "o" is a vowel sound). Actually, "old" starts with a vowel sound, so use an.
✔ Answer: an

5. _________ water is important for life on the Earth. We must keep it clean.
→ Talking about water in general (uncountable noun). No article needed.
✔ Answer: no article

6. Lisa has _________ exercise book on her desk. The exercise book is blue.
→ First mention of a specific book (on her desk), so it's specific but not yet known. But since it's introduced as "an exercise book", we use an because it's a singular, countable, non-specific noun.
✔ Answer: an

7. I am reading _________ old magazine now. It's very interesting for me.
→ A specific magazine (the one I'm reading), but not previously mentioned. However, since it's the one being read now, and only one, it's specific. But we don’t know which one. Wait — actually, "an old magazine" implies a non-specific one. But if it's "now", and it's the one being read, it could be the. But here, it's likely just introducing a general object. So:
→ "An old magazine" = any old magazine, not a specific one.
✔ Answer: an

8. We saw _________ little bears in the zoo. The bears were funny.
→ Plural noun ("bears") — no article used with plural countable nouns unless specific. Here, it's general.
✔ Answer: no article

9. You have only half _________ hour for lunch. Hurry up!
→ "Half an hour" is a fixed expression. "Hour" starts with a vowel sound → use an.
✔ Answer: an

10. I bought a book and put it in my bag. _________ book is very heavy.
→ The book is now specific (the one bought earlier).
✔ Answer: the

11. I am sure _________ man at the corner is waiting for you. He is looking at us.
→ Specific man (at the corner).
✔ Answer: the

12. He was wearing _________ ugly shirt when I first met him.
→ Non-specific shirt (just any ugly shirt). "Ugly" starts with a vowel sound? "U" is a vowel, but pronounced /ʌ/ → vowel sound → an
✔ Answer: an

13. Robert is _________ driver. He drives big trucks.
→ General profession. "Driver" is a singular countable noun, non-specific.
✔ Answer: a

14. I believe that _________ friendship plays an important role in people's lives.
→ "Friendship" is an uncountable noun. When talking about abstract concepts like "friendship", we usually use no article.
✔ Answer: no article

15. Laura is _________ pretty girl. She looks very smart, too.
→ Introducing Laura as a girl (general description). "Pretty" starts with a consonant sound → use a.
✔ Answer: a

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✔ Final Answers:

1. the
2. the
3. a
4. an
5. (no article)
6. an
7. an
8. (no article)
9. an
10. the
11. the
12. an
13. a
14. (no article)
15. a

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📝 Summary of Key Points:

- Use "the" for specific items.
- Use "a/an" for non-specific singular countable nouns.
- Use no article with uncountable nouns (water, friendship), plural nouns (bears), or general concepts.
- Remember "an" before words starting with vowel sounds (e.g., "hour", "ugly", "old").

Let me know if you'd like a printable version or explanation for any specific sentence!