Unit 2 Exercise 2 - Present perfect continuous | Oxford Solutions ...
Unit 2 Exercise 2 - Present perfect continuous, Unit 3 Exercise 1 - Speculating and predicting, Unit 3 Exercise 2 - Future perfect and future continuous, Unit 4 Exercise 1 - Comparison, Unit 4 Exercise 2 - Talking about imaginary situations, Unit 5 Exercise 1 - Quantifiers, Unit 5 Exercise 2 - Modals in the past,