when前后时态when 后面可以加进行时

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when前后时态when 后面可以加进行时
when前后时态
when 后面可以加进行时

when前后时态when 后面可以加进行时
when 后面可以跟 一般现在时,一般过去时.
例如:
He was doing his homework when his father came back.
He will write to you when he arrives in Beijing.