Buatin lagi dog passive voice

some flowers are planted by my parents

Simple present tense
A: my mother writes a letter every friday
P: a letter is written by my mother every friday

Simple past tense
A: nana drank a glass of milk two days ago
P: a glass of milk was drunk by nana two days ago

Simple future tens
A: i will buy a new motorcycle next year.
P: a new motorcycle will be bought by me next year.