定语从句要学好一定要会分析从句句子成分，that属于关系代词，当从句中缺主语宾语时可以选用
that，where是关系副词，在从句中做地点状语，从句中不缺必要成分。
this is the school____I visited last week.
this is the school ____I had a meeting last week.
例子比较简单，第一个句子中，visit是及物动词，所以从句中缺宾语，那么先行词school在句子中
作宾语，补全是I visited the school last week,所以可以选that
第二个句子中 I had a meeting主谓宾，句子成分齐全，所以不缺，那么school是表地点的做地点状
语，补全可以是i had a meeting in the school，所以用关系副词where，相当于in which
望采纳，谢谢！（PS:非本人做）
追问那么这道题怎么做啊？
I visited the house（where/which ）my grandparents are still living yesterday
好像只有主谓吧，是不是用which？
追答不是，是用Where
live in 是一个短语，后面省略了in，故前面用in which
in which=where，故用where
追问是不是后面有及物动词就是作宾语呢？
追答不是。 及物动词后面可以跟宾语，看情况来说；但不及物动词后一定不能直接跟宾语，还要加个介词。