句子转换。

1. She is an American, and he is English. (变成复数句子)

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2. Are the twins in different classes? (变成陈述句)

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3. They can see the blackboard and the door in the picture. (对划线部提问)

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4. Lucy and Lily are new students. (变成一般疑问句)

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5. —What are these? 

    —They are apples. (变成单数句子)

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6. My teacher is over there. (就划线部分提问)

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