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Simple Past Tense

Use the simple past tense to express action completedat a specific time in the past. To form the past tense, add the ending-ed to the base form of the verb. (But see IrregularVerbs for verbs that form the past tense differently.)

In the Los Angeles basin during December 1982, acid fogreached a level of acidity comparable to that ofvinegar.

--C. Donald Ahrens, Meteorology Today

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