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-.
For the reader, topic sentences announce what the paragraph will be about and demonstrate how different paragraphs and ideas are connected to each other. A topic sentence generally appears early in a body paragraph (often the first or second sentence) and controls the paragraph. A topic sentence is like a mini thesis sentence for each paragraph and serves to unify the contents of the paragraph.