The full stop or period is the most commonly used punctuation mark in English. The most common use of the full stop is to mark the end of declaratory sentences. It can also be placed after initial letters used to stand for a name, as in R.I. Chalmers, and also to mark the individual letters of some acronyms and abbreviations. While first introduced by Aristophanes of Byzantium in the third century, the full stop in its current position became popular from the ninth century onwards, and once movable type printing had become established, the full stop as we know it became the norm. It is not a difficult piece of punctuation to use, and is far easier to use than the comma. This lesson has a video that will tell you all about the full stop and how to use it, and a quiz to check your understanding of some of the vocabulary in the video.
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