Bài 1 : Tìm lỗi sai và sửa 1 My friend and I was at the hairdresser" s yesterday . --> 2 My sister in law used to had long hair but now she has short hair --> 3 Did your father worked in a tobacco factory before he retired ? --> 4 why you did not come to the meeting last week ? --> 5 My best friend and I use to hated each other when we first met --> 6 Was Anna be successful with her project last week ? --> 7 Yesterday morning I readed several chapters of the book " The little prince " --> 8 Last summer we involved in community service in our neighbourhood , so we did go on holiday -->