=========英语小问题==========

同意四楼五楼，他们的说法正确，这个room、是先行词，但是后面少了连接词，所以这里可以用The room （in which ） where we usually watch TV and spend our time during the daytime is the living room.

应该是：
The room we usually watch TV and spend time in during the day is the living room.

没有啊

有错误，定语从句少了引导词
the room 后面应该加上in which或where

The room in which we usually watch TV and spend our time during the daytime is the living room.

the room （where/in which we usually watch TV and spend time during the day ）is the living room
主句the room is the living room，缺少连接词，where/in which做状语成分