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Prepositons are sometimes called location words, but they can help to explain other kinds or relationships between words. Prepositions can also be used to help explain when something happens. Prepositions which help to explain when include:
during until since after before following
on near under by through beneath in over around
Abbreviations
Abbreviations exist for commonly used words, names of organizations, names of months and days of the week, for units of measurement, etcetera. Here are some abbreviations for common words:
WORD(s) ABBREVIATION etcetera etc words per minute wpm junction jct railroad RR canyon cyn valley vly point pt synonym syn antonym ant amount amt abbreviation abbr especially esp
ABBREVIATION FULL WORD O oxygen C carbon H hydrogen He helium N nitrogen Mg mercury Cu copper