N (nơi chốn) + where + S+ V 

N (thời gian) + when + S+ V 

N (vật) + which + V /S +V 

N (người) + who + V 

N (lý do) + why + S + V 

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1. This is the house where we often stay in summer.

2. I'll show you the second-hand bookshop where you can find valuable books.

3. I have not decided the day when I'll go to London.

4. He was born on the day when his father was away.

5. The book is a telephone directory in which we can look up telephone numbers.

6. Mrs. Brown rang Dr. Brown, who was going to carry out an urgent operation at the moment.

7. The airport where we're going to arrive is the most modern one.

8. She doesn't want to speak of the cause why she divorces her husband.

9. The days when I lived far from home were the saddest ones.

10. I never forget the park where we met each other for the first time.

`color{orange}{~MiaMB~}`