2) progressive or not?--see, look at, watch, hear, listen to, and think about / think that

source: atoothforatooth  2012-02-08 
http://www.greenscreenenglish.com

Look / See / Watch
source: EnglishLessons4U   2010-02-05 
quiz: http://www.engvid.com/english-vocabul...

Listen & Hear - What's the difference?
source: EnglishLessons4U  2010-03-02 
quiz: http://www.engvid.com/english-vocabul... 

"Think" - Common Mistakes in English
source: JenniferESL  2007-09-25

Say, Tell, Hear, Listen - How to use them correctly
source: JamesESL   2008-11-21 
http://www.engVid.com/ 

listen vs. hear
source: Watch, Listen & Speak English! - E.M.N     2014年7月19日

look vs. watch vs. see
source: Watch, Listen & Speak English! - E.M.N     2014年7月14日

Difference between LOOK, WATCH & SEE 
source: Learn English with EnglishClass101.com          2017年12月12日

LOOK (can be used as an action verb and as a stative verb) 
source: LearnAmericanEnglishOnline         2017年12月13日

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