描寫時間的：

1.I will never forget the day when I first started school.

2.We will never forget the days when we studied together.

3. October 1, 1949 was the day when the People"s Republic of China was founded.

4. Gone are the days when we Chinese were looked down upon.

5.The parents will never forget the night when their son was born.

描寫地點的：

1. This is the house where my father used to live.

2. My mother works in a school where there are over 2000 students.

3. The hall where the meeting is being held now is on the third floor.

4. Is this the park where you found some special trees?

5. I have lost my bag where I put my cell phone.

描寫原因的：

1. Do you know the reason why he was late?

2. The reason why he was absent from school was that he was ill.

3. Can you tell me the reason why he did that?

4. I still don"t know the reason why she went there alone.\

5. He told me the reason why she was crying.