"You are at school."

Translation: Kamu ada di sekolah.

[SWybrow]

Why does "Anda" instead of "Kamu" give a wrong answer?

[SaefulAkbar]

It should be right. Report it to DL. This lesson is still in beta anyway

[anno35]

Agreed with SWybrow and is there somewhere an explanation of the use of 'ada'?

[SaefulAkbar]

"Ada" is a word to describe existence. In English it may be equivalent to "there is/are" or "available". Here's some example of its use :

1. Ada banyak guru di sekolah. Lit. translation : Exist. A lot. Teacher. At school (There are a lot of teachers at school)
2. Bukunya ada dimana? Lit. translation : The book. Exist. Where? (Where is the book?)
3. Masih ada satu kursi. Lit translation : Still. Exist/available. One. Chair/Seat. (There is one chair still available)

[Cameron298]

Think of this sentence as "you exist at school". Not a very common English sentence, but remembering it this way made it easier for me

[QuerulousFalcon]

What about "Kamu disekolah"?

[SaefulAkbar]

That'd be right. However the correct writing should be "di sekolah" (with space). You should distinguish between the word "di" (meaning at), and the prefix "di-" (which is used to transform verb; for example "di-" + "makan" (eat) = dimakan (eaten).

This, of course, only a problem in written form of the language