为什么where do you live和who do you live with第一句句末不加介词,第二句句末要加介词

who do you live with? Which city do you live in?Where do you live?这两句话为什么一个有介词结尾,一 Where do you live - I live in an apartment 句中LIVE后为何不要介词? 你住哪里,是where do you live还是where do you live in?后面带不带介词?why? where do you live? where do you live为什么用do where do you live?为什么不是where are you live? who do you live with还是whom? where do you live?还是 where do you live in where do you live回答 where about do you live where do you live in还是where do you live?为什么?