This sheet can be used as a partner activity or a quiz.
For the partner activity: Cut the sheet in half. Students will complete the sentences using the correct form of ser or estar. At the bottom of the sheet each student has the correct answers to his partner's sentences. Students then take turns in reading their sentences to each other and checking their answers.
For the quiz: The second page (without the answers at the bottom) can also be used as a brief quiz to check for understanding.