2. Choose the correct words. 1. You should/mustn't forget to call me tonight. 2. Students should/mustn't run in the corridors. 3. You must/shouldn't stay up so late - you're tired today. 4. I think they must/should relax more. 5. We shouldn't/mustn't be noisy in the library.

Correct answers:

• 1. You mustn't forget to call me tonight.
• 2. Students mustn't run in the corridors.
• 3. You shouldn't stay up so late — you're tired today.
• 4. I think they should relax more.
• 5. We mustn't be noisy in the library.

Mustn't means something is forbidden or very important not to do. Should and shouldn't are used for advice.

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