三个词都是"在旁边,在附近,靠近"的意思：
但是表示远近时候还是有区别的.从近到一般近到最近为到：NEAR > BESIDE> NEXT TO
beside“在…旁边”一般指空间上 Come and sit beside me.
near：“不远的,接近的”指空间或时间上 the near future 不远的将来；
My aunt lives quite near.我姑姑住得相当近.
next to：与…邻接的,其次的 The shop is next to the school.
I live near the park.我住在公园附近.
There is a book beside the pen.钢笔附近有一本书.
The bedroom is next to the bathroom.卧室紧挨着浴室.