This worksheet consists of making students complete the conjugation of the verb to work in the Present Perfect. It points out that the past participles of regular verbs follow the same spelling rules as the past simple forms. You can use it for virtually any level, especially when you have students who feel lazy about taking down grammar notes but need to revise the tense formation rules. You can also use it as an assignment when you have a one-day leave for an appointment and must leave your class with a teacher on duty. They can work alone because all the answers are in the worksheet, they only have to be a bit observant. Obviously, it works especially well if you have used a similar worksheet previously.