Pattern: a-an-rate
Structure Overview
Formula: [Quantity / Price] + a / an + [day / week / month / kilo / hour]
Core Meaning: Distributive frame expressing rate, frequency, or cost per unit.
💬 Contextual Examples
- Apples are $3.99 a kilo.
- She exercises four times a week.
- The train travels at 120 miles an hour.
🎴 Interactive Web Practice (Click to Reveal)
Practice 1: He visits his grandparents once ______ month.
Answer:
a
Practice 2: Gas costs about $1.50 ______ liter right now.
Answer:
a
🔗 Knowledge Base Connections
- 🔑 Parent Keyword: a-an