Rewrite the sentences

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11. Rewrite the sentences.
1.If you eat sensibly, you'll be healthy. (unless) Unless you eat sensibly, you won't be healthy.
2 He might fail the exam unless he tries harder. (if).
3 You can't take my camera unless you promise to look after it. (if)
4. It won't be the same unless you come with us. (if)
5. If you don't know the answer, don't say anything. (unless).
6 Sam's parents will be worried unless he calls them. (if)