Every day at 3 o'clock 12B plays piano这句英语里面的12B是什么意思?9A has visitors，.这句的9A又是什么意思

Every day at 3 o'clock 12B plays piano.尤其是12B这个, She goes to school at 7 o'clock every day.对at 7 o'clock提问 She gets up at six o'ciock every day.(对at six o'ciock 提问） Tom gets up at six o`clock every day.对at six o`clock提问 Every day at 3 o'clock 12B plays piano 时间后的AB怎么理解?Every day at 3 o'clock 12B plays piano.Every Sunday,9A has visitors.Every day at 7 o'clock 18A cooks dinner.It smells terrible.I have routines too,routines for the whole complex.这段 Every day at 3 o'clock 12B plays piano.还有9AEvery day at 3 o'clock 12B plays piano.Every Sunday,9A has visitors.3 Every day at 7 o'clock 18A cooks dinner.It smells terrible.I have routines too,routines for the whole complex. He gets up at five o'clock every day对at five o'clock 提问 — — —he get up every day? I go to school at seven o'clock every day.的特殊疑问句是啥 school,every,to,they,go,at,o'clock,day,five(连词成句) When will your father r______ from work every day?At about six o'clock. He____(have)dinner at six o`clock in the evening every day. Mike gets up at six o' clock every day.(改为否定句） they do homework at seven o'clock every day怎么变一般疑问句? He gets up at 6:00 o'clock every day改为一般疑问句 He gets home at eleven o'clock every day.(改同义句） I get up at seven o'clock every day.英语翻译是什么 Mike gets up at six o'clock every day.该否定 at、day、Tom、eight、every、wakes、o’clock、up〔.〕连词成句