Lesson 18: Teacher Guide & Master Solutions
Phonics & Article Discrimination
The Sound Principle • Consonant vs. Vowel Sounds:
The choice between a and an is governed entirely by sound, not spelling! Highlight the contrast between hat / house (aspirated /h/ consonant sound → a hat, a house) and hour (silent h, beginning with the vowel diphthong /aŹ/ → an hour). This is one of the classic phonetic benchmarks in elementary English.
Section A: Master Article Key (15 Words):
• Consonant sound words (use "a"):
1. a hat • 4. a book • 7. a house • 14. a newspaper
• Vowel sound words (use "an"):
2. an egg • 3. an owl • 5. an hour (silent h) • 6. an island
8. an uncle • 9. an orange • 10. an inch • 11. an echo
12. an elbow • 13. an ear-ring • 15. an umbrella
Section B: Sentence Writing Exemplars (Accept equivalent student sentences):
1. an umbrella → The little girl carried an umbrella in the autumn rain.
2. an owl → An owl perched quietly upon the old fence post.
3. an hour → We waited an hour for the carriage to arrive.
4. a newspaper → Grandfather reads a newspaper by the fire every evening.
Phonics Diagnostic & Common Pitfalls:
• Silent "h" trap: Children frequently write "a hour" because the word starts with the consonant letter h. Have the child read aloud: "a our" vs. "an our" to feel the smooth transition.
• Hyphenated compound: Note that ear-ring takes an because of the initial vowel sound in ear.
| Evaluation Criterion |
Exemplary (4) |
Proficient (3) |
Developing (1-2) |
| Article Accuracy (Section A) |
15/15 correct, including the silent "h" in an hour. |
13-14/15 correct with minor slips on 1-2 words. |
Fewer than 12 correct; confuses vowel and consonant initial sounds. |
| Silent "h" Discrimination |
Correctly writes an hour and contrasts it with a hat / a house. |
Identifies an hour after oral reading prompt. |
Persistently applies a to hour based on visual spelling alone. |
| Sentence Composition |
Three original, syntactically complete sentences with correct articles. |
Three complete sentences with minor phrasing or spelling flaws. |
Writes sentence fragments or misuses chosen articles in context. |
| Mechanics & Handwriting |
Flawless capitalization, correct end periods, and neat alignment on lines. |
Legible handwriting; 1 minor capitalization or punctuation slip. |
Inconsistent handwriting, missing terminal punctuation. |