按要求完成下列句子。
(1) We are making a model plane. (变成一般疑问句)
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(2) The boys are sitting under the tree. (对划线部分提问)
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(3) Look out of the window. (改为否定句)
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(4) We can see some birds over there. (对画线部分提问)
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(5) The children have some apples. (改为单数句子)
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