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The document discusses using the phrase "made of" to describe the materials that objects are composed of. It can be used with both singular and plural nouns, and questions about what something is made of are answered with "is made of" or "are made of" depending on whether the noun is singular or plural.






The phrase 'made of' describes the materials of objects, e.g., a telephone is made of plastic.
'Made of' can be used for both singular and plural objects, such as 'My bicycle is made of metal'.
In singular constructions, we use 'is + made of', e.g., 'My ball is made of rubber'.
In plural forms, we use 'are + made of', e.g., 'My shoes are made of leather'.
To answer singular inquiries using 'made of', e.g., 'What is the ball made of? It's made of rubber'.
To answer plural inquiries, we use 'What are the shoes made of? They're made of leather'.