This list of countries by rail transport network size based on International Union of Railways data ranks countries by length of rail lines worked at end of year updated with other reliable sources. These figures also include urban/suburban mass-transport systems; as well as lines which are not used for passenger services. 1 List.
Review with students what a topic sen-. tence is. (The topic sentence is the sentence. containing the main idea of a paragraph-. often, but not always, the first sentence in. the paragraph.) Put a couple of good models. from the daily newspaper on the overhead-.
Part 2 of 3: Writing a Successful Topic Sentence. 1. State your main idea clearly. Because your topic sentence is likely the first sentence in the paragraph, it needs to clearly state the subject matter of your paragraph without being wordy or difficult to understand..