1、where 含义为at / in the placewhere从句完整，若将where置换后，主句完整，则说明可行。句子中的where代表的地点确定eg: please stay where you are.请留在原位从句where you are语法完整，主句替换后为stay in the place，句子完整，可行
2、where 含义为to / in what placewhere从句完整，若将where置换后，主句完整，则说明可行。句子中的where代表的地点不确定he doesn't know where she is going他不知道她去哪里了从句where she is going语法完整，主句替换后为he doesn't know what palce, 主句完整，可行，需注意的是，此例中to需移至going 后
3、where 含义为the place, 地点不确定where从句完整，若将where置换后，主句完整，则说明可行。eg. I know where their house is从句where their house is 语法完整，主句替换后为i know the place, 主句完整，可行
4、where 含义为in which , where从句修饰名词用where从句完整, 主句完整, 且where从句修饰名词，则说明可行。eg. this is the room where the children sleep从句where the children sleep语法完整， 主句完整，从句修饰room，可行
5、wherevereg. I can go where i want , when i want
6、含义为：a particular point in a story, process, etc.故事或进程中某点where从句完整, 主句完整, 且where从句修饰名词，则说明可行。eg. the project is at a point where the end is in sight工程已进入完工阶段the town has reached the size where traffic is a problem该镇规模增大后交通成为一个问题。另一含义：a particular part of what is being discussed.某一部分where 从句完整，将where换成part，主句完整，则说明可行that's where you are wrong你错在这里that is the part 完整，则说明可行