III. Turn the following questions into the passive.
1. Is Tim cleaning the house? ............................................................................................................................
2. Who built the Pyramids?............................................................................................................................
3. Who smashed the kitchen window? ............................................................................................................................
4. When did the wind blow down the tree? ............................................................................................................................
5. Who has to sign these papers? ............................................................................................................................
6. Who is going to welcome the guests? ............................................................................................................................
1. Is the house being cleaned by Tim?
2. By whom was the Pyramids built?
3. By whom was the kitchen window smashed ?
4. When was the tree blown down by the wind ? .
5. Who has to sign these papers? By whom has these papers have to be signed by? ( ko chắc)
6. Who is going to welcome the guests?
Who are the guests going to be welcomed by? ( không chắc)
