1. Sydney Opera House was completed in 1973.

2. Nhi asked Nga if she knew My Son.

3. Have you finished your homework yet, Ba?

4. They was sleeping when the mailman came.

5.  We are delighted that you are interested in protecting the environment.

6. The celebration will be held tomorrow.

7. They played tennis at 10:30 yesterday morning.

8. Eiffel tower was designed by Alexandre Gustave Eiffel in 1889.

9.  Nam spend many hours every day learning English.

10. Last week, she bought an English Vietnamese dictionary.

1. Sydney Opera House / complete / 1973

  → The Sydney Opera House was completed in 1973.

2. Nhi asked Nga / she / know / My Son

  → Nhi asked Nga if she knew My Son.

3. You / finish / homework / yet, Ba?

  → Have you finished your homework yet, Ba?

4. They / sleep / when / the mailman / come.

  → They were sleeping when the mailman came.

5. We / delighted / you / interested / protect / environment

  → We are delighted that you are interested in protecting the environment.

6. The / celebration / will / hold / tomorrow.

  → The celebration will be held tomorrow.

7. They / play / tennis / 10.30 / yesterday morning

  → They were playing tennis at 10.30 yesterday morning. 

8. Eiffel Tower / design / Alexander Gustave Eiffel / 1889

  → Eiffel Tower was designed by Alexandre Gustave Eiffel in 1889.

9. Nam / spend / hour / learn / English / every day.

  → Nam spends an hour learning English every day.

10. Last week / she / buy / English Vietnamese dictionary.

  → Last week, she bought English-Vietnamese Dictionary.