sentence: Some roofs are sloped, or pitched, so the rain and snow fall off easily.
sentences_before: A 'roof' is the top part of the building. It keeps out rain and snow and protects people from the sun.
sentences_after: Some roofs are flat, but even flat roofs have a little bit of pitch so the water can flow away towards a drain.
concept_name: roof
headings: Roof
categories: Basic English 850 words Construction