Ex.1
2. must
3. mustn't
4. must
5. mustn't
6. mustn't
Ex.2
1. You must
2. You mustn't
3. You must
4. You mustn't
5. You must
6. You mustn't
Ex.3
1. must have
2. mustn't eat
3. must walk
4. mustn't use
5. mustn't listen
Ex.4
1. You must buy a ticket before ...
2. You mustn't talk loudly in the library
3. You must change your shoes ...
4. You must leave your parking ticket...
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