надо не согласится с мнением автора
1.Mother has cooked supper.2.We have shopped a lot.3.The children have started to sing.4.Freeddy has danced a lot.5.They have decorated the New Yeat tree.
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Отметь как лучшее,пожалуйста)

Mother hasn't cooked supper.2.We haven't shopped a lot.3 The children haven't started to sing . 4 Freeddy hasn't danced a lot. 5 They haven't decorated the New Yeat tree.