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1.一般来说,表示经常、多次和重复的行为,应该用未完成体。但个别时候,完成体也可以表达这种含义,此类用法大多带有口语色彩。例如:
1. In general, to express regular, repeated and repetitive behavior, the unfinished body should be used. But individual time, the body can also express this meaning, such use mostly with colloquial colors. E.g: