Bài tập chuyển đổi thì hiện tại hoàn thành sang quá khứ đơn 1/ How long have you been here 2/ This is the first time I have seen such a beautiful girl. 3/ I haven’t gone to school for 4 months because of covid-19. 4/ I have never visited Halong Bay before. 5/ I haven’t cheated in exam for years. 6/ I have married for 10 years. 7/ How long have she lived in Danang? 8/ He hasn’t smoked for 2 years. 9/ I have learnt French for 3 years. 10/ I haven’t met her for 5 days Chỉ giúp em vs ạ