谈论文的写作，住往从正反两方面来论说，且都有其约定俗成的谈论形式，即从“主题句一正面论说，不和论说一定论”四大块去营建文章的根本结构(四块论)。例如，某标题要求论说“校园规则‘课间学生只能呆在自己的教室里’对吗?”这一论题。假如作者认为校园的规则不对，他就应该在文章榜首块(段)亮出自己的观念：There is currently much discussion about whether students should stay in their own classrooms or not during break times.Personally I believe that—。而第二块应该从正面论说“课间不能只呆在自己的教室里”的理由。比方可以说：I would argue that break times are our only opportunity to choose what we want to do. 第三块则从不和观念，即“课间只能呆在自己的教室里”动身，驳斥对方观念或进一步论说己方观念。例如可以说：Another reason why people say that students have to stay in their own classes at break times is that it would be difficult to organize dinners.最终一块(段)则用不同的言语再次着重已方观念。乍一看去，谈论文“四块论”似乎有“八股文”的嫌疑，但“四块论”契合人的认知规则，所以值得多多仿照和练习。
1、Firstly，it is very convenient in daily life.There are many shops and supermarkets in a city.I can buy everything I need easily in these places.When I am sick，I can easily see a doctor in any clinic or hospital.Transport services are good in a city.when I want to go somewhere，I can take a bus，a train or something else.There are also many kinds of entertainment in a city.Public buildings(such as libraries)and parks can easity be found in a city，too.
2、First，it is convenient and comfortable to live in a city.To begin with，there is good housing in a city，as all the houses and flats are well-equipped with good facilities and surrounded by modern amenities such as places of entertainment，public libraries and parks.
1、Students always feel relaxed and happy during breaks.(叙说性语句)
2、Break times are scheduled for about 10 minutes.(说明性语句)
Although some people believe that students should stay in their own classrooms during break times，I would like to argue that we should be allowed to spend break times in another class.
The most important reason for believing that is that many students have friends in other classes.We spend all day in our own classroom，and break times are the only time we have to spend with other friends.It can become very tedious(令人厌倦的)to have to spend even more time with the same people.
A further reason for allowing student to choose where they spend their break times is that it would stop arguements.If students are forced to spend time with classmates who are not good friends，they can annoy each other.This leads to problems that have to be sorted out by teachers.
Teachers argue that we all should stay in our own classes，because it is then easier to know what is going on.They say that it is difficult to keep track of students when they are walking round the corridors.However，students could be given the chance to choose a different classroom to spend the whole break time in.That would mean that there would not be any students in the corridors.
As I have explained，although it might be a little easier to manage when everyone stays in their own classroom，it would make break times happier for all students if they were allowed to choose where they spent their time.