Judging the main topic of an article usually requires analysis from multiple perspectives. Here are some possible methods: 1 Read the article and understand its basic meaning. The main sentence is usually the core of the article, and its meaning is usually throughout the whole article. 2 Pay attention to the structure of the article. An article usually has a clear structure. The topic sentence usually appears at the beginning or end of the article or plays a vital role in the structure of the entire article. 3. Analyzing the keywords and phrases of the article. Thesis sentences usually appear in important keywords and phrases, which are usually the core content of the article. 4. Understand the author's point of view and standpoint. The author would usually express his or her own opinion and standpoint in his or her article. The main sentence usually reflected the author's standpoint and viewpoint. 5. Comparing it with other relevant information. When analyzing the article, you can compare the article with other relevant information to understand the author's point of view and position, and determine the position and expression of the main sentence. It was important to note that judging the main sentence of an article was not a simple matter. It required the reader to think deeply and analyze it during the reading process.