非限制性定语从句)

2．很显然学生到处乱涂乱扔是不合适的。

Students tend to litter and scribble about，and it is clearly an improper behavior.(并列句)

It is clearly not appropriate for students to litter and scribble about.(it作形式主语)

Dear Mr Headmaster，

　　I am Li Hua，a student from Class 1，Senior Ⅱ.I am writing to draw your attention to some improper behavior among us students on our campus：scribbling and littering，which makes our school a dirty and unpleasant place to study in.

　　It is clearly not appropriate for students to litter and scribble about.My suggestion is that the school place more dustbins around and set up specific rules against such behavior.At the same time，students should be encouraged to develop good habits and better behave themselves.

　　I believe that，with the joint efforts of both teachers and students，our school will become a more enjoyable place in the near future.

　　Thank you for your consideration.

Yours faithfully，

Li Hua