c) "be" verbs

Be - Present Tense
source: LearnAmericanEnglishOnline  2007-12-06
Be negative - Present Tense   2007-12-07
Be Present Tense Questions  2007-12-11
Differences between "be" and "do" in the present tense  2008-09-27

TO BE verb  source: EnglishLessons4U  2011-12-21  quiz:http://www.engvid.com/basic-english-g...

How to Pronounce Contractions: American English Pronunciation
source: Rachel's English  2010-10-22
Transcript: http://rachelsenglish.com/contractions

BE verb
source: English Lessons with Alex      2011年10月26日
quiz here: http://www.engvid.com/basic-english-g...

Using "to be" to describe your life
source: Learn English with Rebecca 2012年11月2日
quiz: http://www.engvid.com/use-to-be-to-de...

TO BE verb - AM/IS/ARE
source: Learn English Lab       2016年6月10日
- http://www.LearnEnglishLab.com

Verb "to BE"
source: Crown Academy of English       2017年6月27日

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