在英语语法中,如何判断定语从句缺什么成分?请叙述的明了一些

简单做法：（根据上下文判断）把定语从句拿出来（连引导词）把引导词去掉,译句子如果意思完整,就是结构完整；如果意思不完整,就是结构不完整.从意思上来判断缺少什么成分.
例子1：He is the man who I am looking for. who I am looking for I am looking for我在找……（缺少宾语）例子2：This is the house where we used to live. where we used to live we used to live我们过去住（结构完整）例子3：The woman who is speaking is our teacher. who is speaking is speaking正在说话（缺少主语）例子4：This is the house which we used to live in. which we used to live in. we used to live in我们过去住在（缺少宾语）