"أَخي مُمْتاز."

Translation: My brother is amazing.

[Abdirahman751232]

Why can't it be "my amazing brother"?

[FRED580759]

Don' understand neither why it couldn't be my amazing brother

[MichelleDa878143]

First, the phrase "my amazing brother" is not a sentence, but the DuoLingo is a sentence.

Second, the adjective "amazing" is in the wrong form for your phrase. To say "my amazing brother" you would have to add "al" to the beginning of "mumtaaz" to show that it is definite.

[Brunellire1]

Idem

[Jasper493254]

I second Abrirahman751232

[vanya_kpop]

Well.. no