1. A topic sentence is a complete sentence.
2. A topic sentence contains both a topic and a controlling idea.
3. A topic sentence is the most general statement in the paragraph.
Step 2自己来写主旨句，这里要注意上述提到的主旨句的要求，那我们可以看到这个段落中，topic是food, controlling idea是significance in new year，所以这句我们的主旨句可以是food is important in new year.
Step 3 检查自己的主旨句
b. 再对比原文主旨句，food also plays an important role in many new year celebrations,看看有什么需要改进的地方，我们就是用了important来表示play an important role in.
比如留学预备三级读写课本U6 reading 2：Fame and fortune do not always have a positive impact on an individual’s life. (这句是topic sentence)
Many careers in the spotlight are short-lived. （这句把not positive 到short-lived具体化）
For example, many athletes’ physical peak only lasts a few years, and singers can have a very limited career. The field that was once the sole focus of their lives becomes something they have little or no involvement in. （这两句是举例来支撑）
As a result, they have a feeling of worthlessness and a complete lack of control. It can also be difficult for them to adapt back to a normal everyday life because they have been so far removed from it for so long. （这句是拓展结果来支撑）
首先把段落中的句子打乱顺序，比如：For example, many athletes’ physical peak only lasts a few years, and singers can have a very limited career. Fame and fortune do not always have a positive impact on an individual’s life. As a result, they have a feeling of worthlessness and a complete lack of control. Many careers in the spotlight are short-lived. The field that was once the sole focus of their lives becomes something they have little or no involvement in. It can also be difficult for them to adapt back to a normal everyday life because they have been so far removed from it for so long.
People attend college or university for many different reasons (for example, new experiences, career preparation, increased knowledge). Why do you think people attend college or university? Use specific reasons and examples to support your answer.
我们可以看其范文：People attend colleges or universities for a lot of different reasons. Career preparation is becoming more and more important to young people. For many, this is the primary reason to go to college, They know that the job market is competitive. At college, they can learn new skill for careers with a lot of opportunities. This means careers, such as information technology, that are expected to need a large workforce in the coming years.
Also, students go to colleges and universities to have new experiences. This often means having the opportunity to meet people different from those in their hometowns. For most students, going to college is the first time they’ve been away from home by themselves. In additions, this is the first time they’ve had to make decisions on their own. Making these decisions increases their knowledge of themselves.
Besides looking for self-knowledge, people also attend a university or college to expand their knowledge in subjects they find interesting. For many, this will be their last chance for a long time to learn about something that doesn’t relate to their career.
I would recommend that people not be so focused on a career. They should go to college to have new experiences and learn about themselves and the world they live in.