把下列句子變?yōu)橄鄳?yīng)的復數(shù)或單數(shù)。
1. This is a red bus.
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2. I'm a good teacher.
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3. Is that an orange?
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4. Where are their skirts?
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5. Do they have some new bikes?
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6. The boy doesn't like its color.
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