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.