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-.
Transition sentences guide your reader smoothly from the topic of the preceding paragraph into the topic of your new paragraph. Writers sometimes begin with a transition sentence before introducing the topic of the new paragraph. A topic sentence states the main idea of a paragraph. Beginning a paragraph with a topic sentence ensures your reader recognizes early in the paragraph what larger idea the paragraph is going to demonstrate. Expert writers may not introduce the topic until the middle or end of the paragraph, and often imply their topics without ever writing a topic sentence.