为什么要说the building being built is our library而不说the building built is our library

为什么要说the building being built is our library而不说the building built is our library 填空the building ----(building)will be our teaching building. I thingk there will be more tall building in the coubtry in 5 years.中building为什么加ing The entertainment building being built will be completed next year.为什么填being built? 【单项选择,要说为什么选这个答案】 It took the workers half a year（）the high building.【单项选择,要说为什么选这个答案】It took the workers half a year（）the high building.A.builds B.to build C.building D.buildMr. 关于英语中的be用法问题The plants want to be watered daily This washing machine needs to be repaired The building to be built is our office building The building being built is our office building.为什么这些句子都要加＂be＂ Be后面为什么用ing形式By preparing for the new test,you will also be building the skills you need to communicate with confidence.请问,be building是什么意思,be后面不是应该借被动语态吗? this kind of building materials-----protect the roof from the rain填be use to吗 为什么 The buiding ____ ____(正在建造的）will be our lab building是不是填 being built呢?若不是,为什么? The building is reported to down last month.A.be torn B.have been tornA为什么不可以? when___,the building will be the tallest one in AsiaA,completing B,completed C being completed Dto be completed问一下为什么不选D项 people are building the subway in Nanchang,so the traffic now is 《 worse> than it used to bepeople are building the subway in Nanchang,so the traffic now is worse than it used to be.为什么填worse The Incas _____(prove) to be great at building things. the building is on fire改成there be结构 英语翻译The building __________will be used as a hospital. The building ___(build) over there will be our library. when will the new teaching building be in s__ the building project to be carried out next year is ,i think ,not easy to complete in time为什么要用to complete 而不用to be completed