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-.
Write a topic sentence. The first sentence of your paragraph needs to be the topic sentence. A topic sentence is an introductory line that addresses what the main idea or thesis of the paragraph is going to be. It should contain the most important and relevant point you wish to make regarding your topic, thus summarizing the paragraph as a whole. Don't: use an obvious fact as your topic sentence.