The bell is ringing .It is time that we begin the class.请问这句话哪儿错了?为什么?

Listen!The bell is ringing.Whatis the bell is ringing可否改写为the bell has just rung The bell is ringing和The bell had just rung有什么区别? 例：The bell is ringing.The bell has just rung.则：He is having breakfast.He has ___________ Class is over.Listen!The bell is ringing for the b 首字母填空 While we are watching TV,the door bell rings.能不能把后半句改成the door bell is ringing. has just The bell is ringing=The bell has just rung中“has just rung”该怎么翻译呢 Listen!There_____ the bell.A.rings B.ring C.is ringing D.is ring The bell is ringing .It is time that we begin the class.请问这句话哪儿错了?为什么? Listen,the bell is ringing.Class is over.Let's have a b_____.The movieTitanic-----(be)on tonight. the doorbell is ringing The bell is ringing.The students are ready ____class.A.for leave B.to have C.to having D.have Mr. Black comes into Class Three. The bell is ringing. He wants to teach an English lesson. Mr. Whi I,when,bell,ringing,to,got,final,the,was,school He awoke to the ringing of an electric bell. .He awoke to the ringing of an electric bell.这句话中的 ring为什么用ringing? 为什么不选a?the bell is ringing.it is time that we __ the class.A begin b should begin c are beginning d began The bell is ringing.It is time that we _____the class.a.begin b.should begin c.are beginning d.began