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.
