There has been an error in the display of this page. There has been an error in the display of the nav on this page. Click on an exercise title to enter the exercise page. Exercise 1: Using verb tenses correctly in your writing Exercise 2: Using simple past (acted) or present perfect (have acted) Exercise 3: Choosing the right verb in conditional sentences Exercise 4: Using verb tenses to write about the past Exercise 5: Using verb tenses to discuss problems and solutions (e.g., CAT essays) There has been an error in the display of this page.