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Present Progressive - Verb Tenses in English
source: JenniferESL   2012-06-24
http://englishwithjennifer.wordpress....
Present Progressive (questions)

Present Continuous verb
source: Crown Academy of English      2013年8月22日
http://www.crownacademyenglish.com

Present Simple and Present Continuous: The Grammar Gameshow Episode 1
source: BBC Learning English           2017年10月11日

How to use Present Continuous
source: Oxford Online English           2017年4月14日
See the full version: https://www.oxfordonlineenglish.com/u...

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