While the words "decrease" and "reduce" are often used interchangeably, there are subtle differences between them. "Decrease" usually refers to a lessening in size, amount, or intensity, often naturally or automatically. "Reduce", on the other hand, implies a deliberate lessening, often through conscious effort or action. Think of "decrease" as something that happens, and "reduce" as something you do.

Here are some example sentences to illustrate the difference:

• Decrease: "The temperature decreased overnight." (The temperature went down naturally.) Translation: The temperature went down automatically during the night.

• Reduce: "We need to reduce our carbon footprint." (We need to take steps to lessen our carbon footprint.) Translation: We must take measures to lessen our carbon footprint.

• Decrease: "The number of students in the class decreased after some moved schools." (This was a natural consequence of students leaving) Translation: The class size lessened because some students changed schools.

• Reduce: "The government is trying to reduce unemployment." (The government is actively working to solve unemployment problems.) Translation: The authorities are trying to lower the unemployment rate.

• Decrease: "His interest in sports decreased as he got older." (His interest naturally lessened.) Translation: His interest in sports lessened as he got older.

• Reduce: "She reduced the speed of her car before turning." (She deliberately slowed down.) Translation: She deliberately decreased the speed of her car before turning the steering wheel.

Notice how "decrease" often describes a passive change, while "reduce" suggests an active process involving intentional actions. While many sentences might use either word and still make sense, paying attention to this nuance will elevate your English writing.

Happy learning!