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"Mandarin has no tenses construed as time (past, present, future, past perfect, present perfect, future perfect, etc.); instead it emphasizes aspect (anticipated, continuous, habitual, progressive, completed, etc.) and marks this with a particle." -- http://www.popehat.com/2012/10/29/fifty-shades-of-wei/ see https://en.wikipedia.org/wiki/Chinese_grammar#Aspects
