(-)là CĐ (+)là BĐ
1-They planted a tree in the garden
+A tree was planted in the garden
2-Someone stole my motorbike last night.
+My motorbike was stolen last night.
3-My father waters this flower every morning.
+This flower is watered every morning.
4-John invited Fiona to his birthday party last night.
+Fiona was invented to John's birthday party last month
5-Her mother is preparing the dinner in the kitchen.
+The dinner is being prepared in the kitchen.