Can / Could / Be able to 

Theory + Tasks!!!!!!!!!!

1. Advanced Grammar in Use: Unit 15, pp. 30-31;
2. Longman Advanced Learners' Grammar: Unit 16, pp. 174-181;
3. My GrammarLab B1-B2: Unit 9, pp. 138-141;
4. My GrammarLab C1-C2: Unit 7, pp. 138-139;
5. Oxford Practice Grammar Advanced, Unit 3, pp. 34-37;
6. Grammar Practice Upper-Intermediate by E. Walker, S. Elsworth: pp. 97-98.

Can (could) have done
theory +  exercises online

• http://www.englishgrammarsecrets.com/couldhave/menu.php
• https://learnenglish.britishcouncil.org/en/english-grammar/verbs/modal-verbs/can-could-and-could-have
• file:///C:/Users/Asus/Downloads/grammar-in-use-intermediate2-students-book-without-answers-and-audio-cd-sample-pages.pdf