1. You don't have to/mustn't use electrical appliances around water.
2. You should/mustn't unplug an appliance from the socket when you are not using it.
3. You shouldn't/have to plug a lot of appliances into one socket.
4. You must/don't have to change a light bulb if it's still working.
5. You have to/mustn't use a safety cover if you have young children.
6. You must/shouldn't always be careful when using electrical appliances.

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