a) "will," "be going to," and "be about to"

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Simple Future Tense
source: TeacherPhilEnglish    2013-01-14

Simple Future Tense
source: Twominute English     2013-04-05
Simple Future Tense
source: Twominute English     2013-10-11

the future with be going to
source: Joe Saenz    2013-01-02
http://www.udemy.com/elementary-cours...

"Going to" & "Will" 
source: Holmwood's Online Learning   2011-07-21
The Future Tense using "will"
source: LearnAmericanEnglishOnline  2008-04-29

The "going to" future tense
source: LearnAmericanEnglishOnline  2008-05-02

Future Simple vs 'Going to' Future
source: Anglo-Link   2011-10-15
https://anglo-link.com

Future Tense in Conversation
source: Learn English with Rebecca  2008-02-16
http://www.engvid.com/

Simple Future Tense: using "will" and "be going to"
source: John E Klein  2009-10-20 

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