"You have an apple."

Translation: Kamu punya sebuah apel.

[funtimeboy55]

what is sebuah

[Pak_Yos]

Sebuah is like 'a' or 'an' in english. It kinda give a specific amount about the object you want to say.

Fun fact: There are many kinds beside sebuah.

Sebuah = a fruit of
Sepiring = a plate of
Secangkir = a cup of
Sebotol = a bottle of
Sepetak = a block of
Sebiji = a seed of
Etc...

So, keep learning, you will find something interesting in this language.

[Erik577129]

I would also like to know when it is used and when not. Sometimes you see it included in an answer and sometimes not

[demoksaputra]

Take a look at this post: https://forum.duolingo.com/comment/3842014

[Lahiliyakarera]

a

[Mike902778]

Sounds very much like a measure word in Chinese (e.g. 个) a language which also lacks plurals.

[HiMeCriss]

or 個 in Japanese (in this case)