where作為連詞的用法：where 含義為at / in the placewhere從句完整，若將where置換後，主句完整，則說明可行。句子中的where代表的地點確定eg: please stay where you are.請留在原位從句where you are語法完整，主句替換後為stay in the place，句子完整，可行where 含義為to / in what placewhere從句完整，若將where置換後，主句完整，則說明可行。句子中的where代表的地點不確定he doesn"t know where she is going他不知道她去哪裡了從句where she is going語法完整，主句替換後為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 後where 含義為the place, 地點不確定where從句完整，若將where置換後，主句完整，則說明可行。eg. I know where their house is 從句where their house is 語法完整，主句替換後為i know the place, 主句完整，可行where 含義為in which , where從句修飾名詞用where從句完整, 主句完整, 且where從句修飾名詞，則說明可行。eg. this is the room where the children sleep從句where the children sleep語法完整， 主句完整，從句修飾room，可行wherevereg. I can go where i want , when i want 含義為：a particular point in a story, process, etc.故事或程序中某點where從句完整, 主句完整, 且where從句修飾名詞，則說明可行。eg. the project is at a point where the end is in sight工程已進入完工階段the town has reached the size where traffic is a problem該鎮規模增大後交通成為一個問題。

另一含義：a particular part of what is being discussed.某一部分where 從句完整， 將where換成part，主句完整，則說明可行that"s where you are wrong你錯在這裡 that is the part 完整，則說明可行。