Open the brackets 1) they (to sell) their house and (to move) in london 2) i ( to take part) in competition in winter 3)somebody(to knock) at the door 4) she (to write) letters to her mother every week 5) i( to see) him since last year 6) i (to write) him soon
2) will take part
3) has knocked
4) writes
5) saw
6) am going to/will write