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-.
Topic Sentences. Since body paragraphs for an essay should be centered around one main idea that relates the thesis, creating a clear topic sentence is helpful for both the writer and the reader. For the writer, a topic sentence makes it easier to stay on topic and develop the main idea without getting off track.