22. The man whose name I don't remember is an artist.

23. The reason which you gave yesterday is not valid.

24. We enjoyed the city in which we spent our vacation.

25. One of the elephants that we saw at the zoo had only one tusk.

26. I looked at the moon that was very bright that evening.

27. My father whom you met this morning goes swimming every day.

28. That car whose engine is very good belongs to Dr Clark.

29. In the class there are 48 students only few of whom the teacher knows.

30. The pupils haven't done their homework, which is too bad.

31. We first met in 1945 when the revolution took place.

32. The girl who won the race is happy.

33. The taxi driver who took me to the airport is friendly.

34. I liked the composition which you wrote.

35. The people whom we visited yesterday were very nice.

36. The meeting where I went to was interesting.

37. The picture which she was looking at was beautiful.

38. I apologized the woman whose coffee I spilled.

39. The professor whose course I'm talking is excellent.

40. THe man whose wallet was stolen called the police.

41. I have  to call the man whose umbrella I accidentally picked up.

42. The city where we spent our vacation was beautiful.

43. That is the restaurant where I will meet you.

44. The town where I grew up is small.

45. I'll never forget the day when I first met you.

46. May is the month when the weather is usually the hottest.

47. 7:30 is the time when my plane will arrive.

48. Do you remember the year when the first world war ended?

49. The man whose father is a botanist is a biologist.

50. I love my parents' house where I was born.

22. That man is an artist. I don't remember the man's name.

$\to$ That man whose name I don't remember is an artist.
23. The reason is not valid. You gave it yesterday.

$\to$ The reason which you gave yesterday is not valid.
24. We enjoyed the city. We spent our vacation in this city.

$\to$ We enjoyed the city where we spent our vacation.
25. One of the elephants had only one tusk. We saw these elephants at the zoo.

$\to$ One of the elephants which we saw at the zoo had only one tusk.
26. I looked at the moon. It was very bright that evening.

$\to$ I looked at the moon which was very bright that evening.
27. My father goes swimming everyday. You met him this morning.

$\to$ My father whom you met this morning goes swimming everyday.
28. That car belongs to Dr Clark. Its engine is very good.

$\to$ That car whose engine is very good belongs to Dr. Clark.
29. In the class there are 48 students. The teacher knows only a few of them.

$\to$ In the class there are 48 students only a few of whom the teacher knows.
30. The pupils haven't done their homework. It is too bad.

$\to$ The pupils haven't done their homework, which is too bad.
31. We first met in 1945. The revolution took place then.

$\to$ We first met in 1945 when the revolution took place.
32. The girl is happy. She won the race.

$\to$ The girl who won the race is happy.
33. The taxi driver is friendly. He took me to the airport.

$\to$ The taxi driver who took me to the airport is friendly.
34. I liked the composition. You wrote it.

$\to$ I like the composition which you wrote.
35. The people were very nice. We visited them yesterday.

$\to$ The people whom we visited yesterday were very nice.
36. The meeting was interesting. I went to it.

$\to$ The meeting where I went to was interesting.
37. The picture was beautiful. She was looking at it.

$\to$ The picture which she was looking at was beautiful.
38. I apologized the woman. I spilled her coffee.

$\to$ I apologized the woman whose coffe I spilled.
39. The professor is excellent. I'm taking her course.

$\to$ The professor whose course I'm taking is excellent.
40. The man called the police. His wallet was stolen.

$\to$ The man whose wallet was stolen called the police.
41. I have to call the man. I accidentally picked up his umbrella.

$\to$ I have to call the man whose umbrella I accidentally picked up.
42. The city was beautiful. We spent our vacation there.

$\to$ The city where we spent our vacation was beautiful.
43. That is the restaurant. I'll meet you there.

$\to$ That is the restaurant where I'll meet you.
44. The town is small. I grew up there.

$\to$ The town where I grew up is small.
45. I'll never forget the day. I first met you then.

$\to$ I'll never forget the day when I first met you.
46. May is the month. The weather is usually the hottest then.

$\to$ May is the month when the weather is usually the hottest.
47. 7:30 is the time. My plane will arrive then.

$\to$ 7:30 is the time when my plane will arrive.
48. Do you remember the year? The First World War ended in that year.

$\to$ Do you remember the year when The First World War ended.
49. The man is a biologist. His father is a botanist.

$\to$ The man whose father is a botanist is a biologist.
50. I love my parents' house. I was born in that house.

$\to$ I love my parents' house where I was born.