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The letter s is far more than just the nineteenth character of our alphabet. While we recognize it as a voiceless sibilant consonant in words like sun, it also serves as a vital symbol in science and navigation. From representing the element sulfur to marking the cardinal direction south, this single character carries significant weight across different fields of study. Beyond its basic form, do you know how to distinguish between its many grammatical roles? This lesson explores how s functions as a suffix for plurals and verbs, and the crucial difference an apostrophe makes when indicating possession or contractions like is and has. We also dive into its use as a unit for time and electrical conductance. Watch the full lesson to master the diverse applications of this essential letter.

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A student writes the letter s on a chalkboard.