v.

　　改正：there are many programs on tv.

　　(there be句型和介词短语)

　　4.i think ride a bike can keep our health.

　　改正：i think riding a bike can keep us healthy.(动名词作主语)

　　建议大家练习或模仿不同题材的文章，特别注意改错总结和吸取范文中好的结构与表达方法，适当运用于自己的文章中。

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