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Verbs and Tenses
source: learnexmumbai  2012-06-21

What are tenses? - Learn present tense, past tense and future tense.
source: Twominute English  2014-6-18
http://twominenglish.com

Tenses--four aspects of the present tense: I do, I am doing, I have done, I have been doing.
source: MrSkypelessons     2017年6月26日

ASPECT and TENSE
source: MrSkypelessons      2017年7月19日

Verb Tenses Guide - Learn About Simple, Perfect, and Continuous ...
source:
Oxford Online English        2017年8月30日
See the full version: https://www.oxfordonlineenglish.com/e...

Learn ALL of the 12 TENSES Easily in 30 Minutes.
source:
 Learn English Lab           2018年2月23日

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