朗读下面短文，体会、领悟加黑部分的时态、语态。
I am Li Fan, chairman of the Students' Union. I am writing① to draw your attention to some improper behaviour in our campus: littering and scribbling. It has been making② our school dirty and unpleasant. I always feel ashamed whenever I see③ this. It is clearly not appropriate for a student to litter and scribble about. Last week, the Students' Union held④ a meeting to seek some solutions to these problems. We were having⑤ a heated discussion when our headmaster came and joined us. After the meeting, the headmaster said that the school had made⑥ efforts to improve this situation and more dustbins would be placed⑦ around. Recently, the Students' Union has set up⑧ specific rules against such behaviour. At the same time, all of us should develop good habits and behave ourselves. We believe that, with the joint efforts of both teachers and students, our school will become⑨ a more enjoyable place in the near future.
[用法体悟]
①现在进行时，表示现在正在发生的动作。
②现在完成进行时，表示从过去开始一直延续到现在并有可能继续下去的动作。
③一般现在时，表示经常性或习惯性动作。
④一般过去时，表示在过去某个时间里(last week上周)所发生的动作。
⑤过去进行时，表示在过去某一时间正在进行的动作。
⑥过去完成时，表示在过去某一时刻或动作之前已经完成的动作，即“过去的过去”。
⑦过去将来时，表示从过去某一时间来看将要发生的动作或将要存在的状态。另外此处主语dustbins为动作的承受者，所以用被动语态。
⑧现在完成时，表示过去发生的某一动作对现在造成的影响或结果。
⑨一般将来时，表示在将来某一时刻要发生的动作或存在的状态。
