段落写作

段落普通由主题句（topic sentence）,扩展句（supporting sentence）,结论句（concluding sentence）组成。一.主题句  主题句是对段落中心思想概括，是作者主要意图反应，是段落关键，其余部分要围绕它展开叙述，所以，主题句是整个段落纲领。
比如： Private cars benefit both individuals and nation. It is very convenient for people to drive to work, study and do many other things. By encouraging people to buy cars, the nation can stimulate consumption and the domestic demand, and enhance the national economy.