this is the place where he works.关系词用WHERe,是因为关系词作状语等于IN THE

把第一句还原,为he works the place ,明显不对,缺少了介词,应该为he works in the place ,再变成定语从句,就是this is the place in which he works,where就等于in which ,所以又转化为原句this is the place where he works。第二句还原：we visited this is place ,visit是及物动词,后面可以直接跟宾语,所以原句不缺成分,直接改为定语从句：this is the place which we visited 再问： this is the place where he works为什么是关系词做状语那？ 再答： 把第一句还原，为he works the place ，明显不对，缺少了介词，应该为he works in the place ,work就是不及物动词啊，后面不加宾语了，所以in the place 就是做状语了，改为定语从句就是关系词做状语了再问： 是不是不及物动词后面就是状语？不及物动词后面不加宾语吗