为什么at school 不用加the 而其他词要例如：at the dentist's

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• 为什么at school 不用加the 而其他词要例如：at the dentist's
• i was at___church on sunday i was___office on moday 为什么第一个不用填上定冠词the 第二个需要什么情况要加上定冠词the,还有my son was at___school on tuesday.这个为什么也不用加 而my wife was at___butcher‘s on wednesday要加.请懂英语的麻烦详细说下,在学习中.
• 这几句英语如何解释(1)He is the younger og the two brothers我想问的是这里younger前面为什么要加the 呢?(2)Beyond the stars , the astronaut saw nothing but space我想问的是stars前面为什么要加the,而space前面不加the.(3)We elected him headmaster of our school for a second time.我想问的是headmaster前面怎么不加定冠词,而second time后面要加定冠词a 呢?顺便问一下这句话是什么意思.(4)That man doesn't look like his age; I think he's somewhat in his sixties.除了用in his sixties 表示,还有其他表示在他60岁的短语吗?(5)Most students can go to college for further educ
• 为什么at school 不用加the 而其他词要例如：at the dentist's
• go to school,go to bed和go homego to school,go to bed ,go home概述：为什么两个要用to,go home不用to?有人说这是因为home是副词.但是,home表示地点,school也是表示地点,go home是短语,school也是短语,为什么home是副词,school不是副词?有人说及物动词可以不加to,那么go to bed要to?bed是床,那么go to bed,不就是及物吗?为什么还要加to?题目那三个单词到底是因为副词而go home不用to,还是因为其他原因?
• 定语从句Yesterday when I met MaryIt's yesterday ＿when＿＿ I met Mary为什么此处用when而不用which?不是说定语从句后要加介词时才用关系副词吗?例如：This is the factory __where___he worked last year因为是work in the factory所以用where那I met Mary yesterday不用加介词为什么也要用when?
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