b) present perfect + "since" or "for"


SINCE & FOR
source: RebeccaESL    2010-08-31
quiz: http://www.engvid.com/english-grammar...

Using "Since" and "For" with the Present Perfect
source: AlexESLvid   2009-08-15
quiz: http://www.engVid.com/
 
PRESENT PERFECT: FOR AND SINCE
source: cursosdeinglesats   2012-01-16

Present perfect - for and since
source: Holmwood's Online Learning   2012-12-12
For and Since
source: Twominute English       2013年6月10日
Exercises: http://twominenglish.com/video/153-Fo...

Present Perfect Tense | Simple or Continuous? | FOR & SINCE
source: mmmEnglish          2017年9月26日
The full transcript: https://www.mmmenglish.com/2017/09/26...

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