按要求转换句型。

1．My father doesn't like playing tennis. (变为肯定句)

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2．I think tennis is very interesting. (就划线部分提问)

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3．Tim has a gold watch. (变为一般疑问句)

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4．I play sports every morning. (变为否定句)

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5．There are old bikes under the tree. (变为单数句)

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检查燃气用具是否漏气时，通常采用划火柴来寻找漏气点。