Here's a multiple choice grammar quiz to check both to be verb and subject/object pronouns. These two grammar subjects, which are the basics of English, do not often cause problems for learners. However, when the object pronouns are introduced, learners usually confuse the place and the use of them. This short 10-question test will be an excellent opportunity to check the basics of both grammar concepts.
Just cut it in half and give it to pairs separately as it's described in the grammar quizzes page.