"Adik merusakkan buku saya."

Translation: Younger sibling damages my book.

[DianaLR]

The sentence needs to begin with a possessive noun or pronoun, i.e. “my”.

[Patrick903816]

In normal English, there needs to be an article or pronoun before "Younger", such as "The younger.." or "A younger.." in this particular translation, though what is implied is "My younger.." (Akakku)

[Cor665827]

Sentence is not good

[boringtomi]

I see what you did there hahaha

[TJR696322]

Duolingo has many different translations, so we can always be wrong. It is becoming annoying.

[phil727975]

It's so annoying

[Dn2iYClu]

I'm still confused with when to use -kan in this setting. "Adik merusak buku saya" would mean the same thing right? Why use the -kan in 'merusakkan'?

[TJR696322]

No different meaning. Rusak and merusak in formal speech is "to damage", so the verb. Merusakkan is then the act of damaging, damages in this case. With added -kan the meaning of the verb changes.

[UpzahwvW]

Saying "Younger sibling damages my book" is unnatural in English. We'd usually identify whose younger sibling it is with a personal possessive pronoun, or we'd put "That" or "the" before "younger sibling."

Technically, "Younger sibling damages my book" isn't grammatically wrong, but it just sounds really weird to say it that way without something else to specify which or whose younger sibling he is.

[Marcus958754]

Your not learning English