The pencil on which he was writing broken.这句话什么意思

The pencil on which he was writing broken.这句话什么意思 -Show me the letter please.-Which one?The one ____ pencil?-Show me the letter please.-Which one?The one ____ pencil?A.in B.with C.by D.on （who)pencil is on the desk? 英语同义句：Some pencil cases are on the floor.( ) ( ) some pencil case on the floor. Which pencil box are the pencils in的意思 there are some pencil on the desk.(some pencil部分提问）.___ ____on the desk? The pencil box is on the bed改为一般疑问句 The tape is on the pencil box.改为同义句 The pencil is long on the desk和The pencil on the desk is long有什么区别吗? the pencil on the desk is new 可不可以说成 the pencil on the table is new I put the pencil case on the desk.对on the desk提问 _____ _____you put the pencil case? your on put desk pencil the连词成句 there are the five pencil on desk 连词成句 there is a pencil sharpener on the desk改成疑问句 用longer、red、yellow、the、the、which、is、pencil、or、one、one?联成句子 which pencil do you like,the long one or the short one?改一般选择疑问句 -Show me the letter ,piease.-which one?the one (in)pencil?为什么用介词in? My pencil is on the table.就画线部分提问,画线部分为on the table.