将下列句子改为复数句子。
1. This is a yellow marker.
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2. Here is a blue chair.
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3. What colour is Peter's shirt?
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4. I'm wearing a new shirt.
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5. What's that?
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6. Is it nice?
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1. These are yellow markers.
2. Here are blue chairs.
3. What colour are Peter's shirts?
4. We are wearing new shirts.
5. What are those?
6. Are they nice?