
This B1 grammar worksheet for adult ESL learners focuses on using modal verbs in the passive voice to express possibility, obligation, advice, and probability. Learners study the clear structure modal verb + be + past participle and apply it through varied exercises such as gap fills, error correction, sentence rewriting, and sentence building. The worksheet uses realistic, adult-relevant contexts and includes a complete answer key for easy checking. It is ideal for classroom lessons, homework, exam practice, or independent study.