... He hurts his hand. (变成一般过去时) I am playing football. (变成过去进行时) The old man fell at the station. (变成一般现在时) ...
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变成过去进行时
To the past continuous tense
以上为机器翻译结果，长、整句建议使用 人工翻译 。
当进行时已变成过去时，也未能净化我周边。
When what's going on becomes a part of the past, it still can't purify things around.
youdao
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