A useful handout for the first lesson with a new class. A handout of the most common irregular verbs, grouped according to pattern. A useful handout if you are just starting the present perfect. Matching cards activity and handout with a record of the expressions and some questions for further practice. Revision cards with questions to practice specific tenses.
Students work in pairs or groups, they take a card and ask the questions to the other students.
You could keep it for students who have finished early.