at the butcher’s 为何要加撇s

at the butcher’s 为何要加撇s were you at the butcher's Did you at the butcher's?和Were you at the butcher's? 英语中在肉店用at the butcher's 为啥不用 in the butcher's were you at the butcher's,为什么用were met an old friend at the butcher's and I g() him I must go to the butcher's.We haven't got ____meat at all where ____(is) you yesterday?I was at the butcher's求大神帮助 我在tom家 能不能翻译成 I am at Tom's ? 就像at the butcher’s 一样 At the butcher's 这是课文的标题 我想问一下课文的标题为什么要加's My brother,Tom,in a butcher’s shop（肉店）.He helps the butcher at the butcher's是指在肉店,但如果表示在许多许多肉店要怎么表示呢?