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esks nine pencils ten books 名詞單數(shù)變復(fù)數(shù) What are those/these? What is that? It’s an English book. They are English books. maps cases keys What’re those ? They’re … . 句子單數(shù)變復(fù)數(shù) 1. This is a book. 2. That is an eraser. 3. It is a red apple. 4. I am a boy. 5. He / She is a teacher. 6. What’s this ? These are books. Those are erasers. They are red apples. We are boys. They ar