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(Transition words for different purposes)
a. coordinatorsso, for
b. paired subordinatorsso...that, such...that
c. subordinatorsbecause, since, now that, as, in order, as long as, inasmuch, because of, due to, owing to, so that, in order that, if only because
d. transitions: therefore, consequently, as a consequence, as a result, thus, hence, accordingly, because of, due to, therefore, consequently, so...that, such...that  (reference: http://www.grammar-quizzes.com/9-10.html)

because of
source: Daily English      2012年11月22日

"because" or "because of"?
source: Learn English with Rebecca       2016年6月10日
quiz at http://www.engvid.com/learn-english-b...

difference between BECAUSE and SO
source: JamesESL English Lessons      2015年2月4日

Showing reason and result
source: Your English Web        2015年9月7日
connectors that indicate condition (if so, if not, otherwise) or result (as a result, because of this, consequently, hence, therefore, thus)        2016年8月26日
CONNECTORS and LINKERS (for time, reason, result and purpose)       2016年4月14日

Because and Commas
source: MrSkypelessons        2017年11月21日

Using  AS, SINCE & BECAUSE correctly
source: Learn English with Let's Talk       2017年11月21日
For complete Lesson transcript – http://www.learnex.in/as-since-becaus...

How to talk about cause and effect
source: BBC Learning English             2015年9月8日
For extra activities and study materials: http://www.bbc.co.uk/learningenglish/...