Rewrite the active sentences in the passive.

1. alexander fleming discovered penicillin in 1928.
2. mr roberts teaches our class physics on tuesdays.
3. leonardo da vinci designed a helicopter in the 15th century.
4. we keep the laboratory door closed at all times.
5. anna lost all her files when her laptop crashed.

1. Penicillin was discovered in 1928 by Alexander Fleming.

2. Our class is taught Physics by Mr Roberts on Tuesdays.

3. The helicopter was designed in the 15th century by Leonardo Da Vinci.

4. The laboratory door is kept closed at all times.

5. All Anna's files were lost when her laptop crashed.

1. Penicillin was discovered by Alexander Fleming in 1928.

2. Our class Physics is taught by Mr Roberts on Tuesdays.

3. A helicopter was designed by Leonardo Da Vinci in the 15th century.

4. The laboratory door is kept by us at all times.

5. All Anna's files were lost when her laptop crashed.