원인과 결과 — because, since, so, therefore

Minho is preparing a cause-effect paragraph about why the classroom feels warmer after lunch. The first draft has many correct sentences, but the ideas do not yet move in a clear order. Minho reads the draft again and marks three parts: the topic, the helpful details, and the sentence that shows why the idea matters.

The temperature increases because sunlight reaches the windows, so the class opens the door for ten minutes. Since the room has many students and the afternoon sun is strong, the air becomes warm; therefore, a short break helps. The class compares two routines and chooses the one that reduces noise and saves energy.

During revision, Minho does not add facts from a website or copy a textbook example. The class uses only their own classroom situation, so every sentence can be checked by the writer. One partner asks, "What is the main point?" Another partner asks, "Which sentence helps the reader most?" These questions make the writing slower, but they also make it more accurate.

The final version is still short. It has one clear opening, two or three useful details, and one sentence that connects the details to the result. When Minho reads it aloud, the paragraph sounds calm and organized. That is the goal of this lesson: not a long essay, but a paragraph that a reader can follow without guessing.

The room is warm because the sun is strong.
Since many students stay inside, the air changes.
The window is opened; therefore, the room feels better.

My topic is ______.
One detail is ______.
This matters because ______.
Therefore, ______.