Odpowiedź:
40. As soon as I had finished what I was doing, I went to bed
41. When the house is painted, it will look different.
42. It would be rude to not invite him.
43. Nothing has changed since you left.
54. I saw him last week, but I haven't seen him since then
45. You can speak English better if you study hard.
46. I have been working at the crossword puzzle for over an hour, but I have made very little progress so far.
47. Does he enjoy to live in Paris?
48. If it is frost tonight, the roads will be slippery tomorrow.
49. Paul studied medicine for some years when we first met.
50. Over two hundred people were invited to the conference we are going to attend.
Nie umieściłeś polecenia, więc wykonałem zadanie z własną myślą, mam nadzieję, że chodziło o to.