Correct the sentences where necessary. 3 I'll be all right. You needn't to worry about me. .. .

4 You mustn't wait for me. You go on and I'll join you later.

5 You don't need to keep these emails. You can delete them. . ..

6 I needn't have gone out, so I stayed at home. . ..

7 I needn't have bought eggs. We had some already.