Reformuler chacune des phrases suivantes en utilisant since ainsi que la date indiquée entre parenthèses. (December) She has been replacing Mrs Koch for three months. (November) I have been working here for six months. (Saturday) He's been staying home for five days. (2014) We've been living in London for four years. (July) Matthew has been leading the project for six months. (2009) I've been living in this house for ten years. (1995) My daughter has been studying in this school for a year. (March) We've been frequenting this establishment for a month. (Monday) Our grandparents have been staying here for three days. (Thursday) She has been ill for two days.