My grandparents likes to live in a house (that;where)is not very big but bright and comfortable.

问题描述:

My grandparents likes to live in a house (that;where)is not very big but bright and comfortable.

that
在定语从句中作主语

that
这是个定语从句修饰house所以我们要看选择关系代词还是关系副词
定语从句没有主语 所以我们选关系代词that