b) past progressive + "while" or "when" clauses

# relevant: 

When and While
source: Xavier Cortina    2013-03-03

WHILE or WHEN? 

Espresso English     2016年10月19日

 When Clauses
source: cursosdeinglesats   2009-12-14

Confusing Words - DURING & WHILE
source: RebeccaESL   2009-04-24
http://www.engVid.com/

'During' & 'While'
source: Learn English with Papa Teach Me   2012-05-07
www.facebook.com/papateachmeenglish

"As," "while," "just as" and Past Continuous
source: MadridTeacher   2009-10-17
The difference between ‘when’ and ‘while’
source:
Learn English with Let's Talk      2016年8月17日
Take the quiz - http://www.learnex.in/the-difference-...

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