I've been here since 1976. 这句话中been后面为什么不加to

Question

I've been here since 1976. 这句话中been后面为什么不加to？？

Answer 1

here 是副词，前面不能在加介词了，比如go home 和go to school的区别

Answer 2

here, there 等代词前面要省略介词 to 等

Answer 3

Here 是地点副词 不能在前面加介词