Sample question from an English grammar worksheet teaching the use of articles 'a' and 'an' with a doctor illustration.

The task in the image is a grammar exercise focused on using the correct article — "a," "an," or "the" — in a sentence.

---

🔹 Sentence:

1. My uncle is ( a / an ) doctor.

We need to choose between "a" and "an".

---

🔍 Step-by-step Explanation:

- The word "doctor" starts with a "d", which is a consonant sound.
- We use "a" before words that begin with a consonant sound.
- We use "an" before words that begin with a vowel sound (a, e, i, o, u).

Even though "doctor" starts with the letter "d", it's pronounced with a consonant sound, so we use "a".

✔ Therefore, the correct answer is:
My uncle is a doctor.

---

✔ Final Answer:

a

---

📝 Summary:

- Use "a" before words starting with a consonant sound.
- Use "an" before words starting with a vowel sound.
- "Doctor" begins with a consonant sound → use "a".

👉 So, the completed sentence is:
My uncle is a doctor.