04.10.2021

 https://test-english.com/grammar-points/b2/unless-even-if-provided-as-long-conditionals/?__cf_chl_managed_tk__=pmd_Tp9sNTKa2ptIDxhe9dj52yhUi2WvklxgHLamPEVUi1Y-1633331526-0-gqNtZGzNAzujcnBszRX9

  

2      https://test-english.com/grammar-points/b2/unless-even-if-provided-as-long-conditionals/ 

3 http://www.blairenglish.com/exercises/emails/exercises/email_complaint/email_complaint.html   

4     https://en.islcollective.com/video-lessons/untitled-video-lessonhow-to-deal-with-the-customers-complain