Read the text carefully. Try to answer the questions. You don't have to write complete sentences. Print the worksheet or... Write the answers in your exercise book.
Let's practise. Click on the link to open the page. You have the chance to choose which exercise you want to do first. Click on the pages 1, 2, 3 or 4 and... ...write the verb in the affirmative, negative, interrogative and mixed forms. It's a great task! Give yourself a chance to learn fast and sure!