There are two rolls of film on the ground.这句话哪里错了?

There are two rolls of film on the ground ------ ------ ---- There are ( ) on the ground.A.two rolls of film B.two rolls there are three rolls of film on the ground改错 There are two rolls of flim on the ground有什么错 There are tow roiis of film on the ground 改错 There are three rolls of films in my bag 这句话错在哪里?我看了半天都找不出来, There are three rolls of films .这句话有错吗?错在哪里? there are three rolls of film in my pocket改错 There are two _______ students on the play ground There are( )on the ground. 英语film作胶卷时两卷胶卷是two rolls of film 还是two rolls of films? there are 【 】[hundred] of people on the ground