task 2
1. shouldn't stay up
2. should try
3. mustn't tell
4. must finish
task 3
1. have to
2. don't have to
3. mustn't
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Answers & Comments
task 2
1. shouldn't stay up
2. should try
3. mustn't tell
4. must finish
task 3
1. have to
2. don't have to
3. mustn't