根据要求改写句子。
（1）She watched TV just now. (改为一般现在时)
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（2） Liu Tao is writing a letter to his grandpa. (改为一般疑问句)
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（3） The children had a picnic last weekend. (改为否定句)
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（4） There is a library at the school.(改为复数句)
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（5） wanted, a, Peter, China, penfriend, in (连词成句)
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