1. We often write our lesson carefully.
⇒ Our lesson are written (by us) carefully.
2. Tom didn’t do his homework last night.
⇒ Tom’s homework wasn't done (by his ) last night.
3. Have you ever met that girl before?
⇒ Has that girl never met ?
4. When will they finish their project ?
⇒ When will their project be finished by us?
5. My students are planting colorful flowers in the school yard at the moment.
⇒ Colorful flowers was planted by my students in the school yard at the moment.