The 317.5km long Moscow Metro is the sixth longest subway system in the world. It is mostly underground, and serves the city of Moscow and the neighbouring towns Krasnogorsk and Reutov. State-owned enterprise Moskovsky Metropoliten owns and operates the metro system.
In prescriptive grammar, the topic sentence is the sentence in an expository paragraph which summarizes the main idea of that paragraph. It is usually the first sentence in a paragraph. Also known as a focus sentence, it encapsulates or organizes an entire paragraph. Although topic sentences may appear anywhere in a paragraph, in academic essays they often appear at the beginning. The topic sentence acts as a kind of summary, and offers the reader an insightful view of the writerâs main ideas for the following paragraph.
Point 1: An English paragraph is a group of related sentences on one subject. Sentences are related to each other so that the paragraph contains clear thoughts about one subject and only one subject. For example, if you are writing about solar power, all your sentences would relate to the sun as a source of energy. Point 2: The most important or main idea is expressed in the topic sentence.