Many apples are in the basket同义句

Many apples are in the basket同义句
答案是There are many apples in the basket.为什么不可以是they aremany apples in the basket.或here aremany apples in the basket.讲讲,急

there is 或are是一个固定结构,表示“有”的意思.其它都表示“是”,语句不通.
再问： 那here呢？不可以？
再答： here不可以，只能表示这儿。