1. He went over to where she was standing.
该句子中的 where 是连接副词，引导宾语从句，用作介词 to 的宾语——此类句式可视为在 where 前省略了 the place，即：
He went over to the place where she was standing.
这样一改，句中的 where 则成了关系副词，引导定语从句，修饰 the place。类似的例子如：
She came back to where Jennie sat. 她回到珍妮坐的地方。
She was free to go to where she liked. 她想到哪里就可以到哪里。
The amount of tax people pay varies according to where they live. 居住地不同，人们所交的税额也各不相同。
2. Put it where it belongs.
此句子中的 where 既不是连接副词也不是连接代词，它是从属连词，在此引导地点状语从句。类似的句子如：
Learn to place the blame where it belongs. 学会责备应受责备的人。
I’m so glad to see you back where you belong. 我真高兴看到你又回到了属于你自己的天地。
其他类似例句：
They waved to us to stay where we were. 他们向我们挥手，要我们停在原地。
The paint has chipped off where the table touches the wall. 桌子接触墙壁的地方漆皮已剥落。
Buildings now stand where there was once a park. 目前高楼林立的地方曾经是个公园。
However,US speakers often use “may” where British English has “can”. 但是美国人常用may的地方，英国人则多用can。
A number of high buildings have arisen where there was nothing a year ago but ruins. 在一年前还是一片废墟的地方已经建起了不少的高楼。