我发现有时会live 有时用live in

假如 是副词或关系副词与live组成句子，不用in

如：

Where do you live?

I like the city where I live.

假如 是名词或代词,或者关系代词等等与live组成句子，要加in

如：

I Live in China.

I live in HuBei Province.

I like the city in which I live.

In which city do you live?