It's great that you did your homework without being asked!
I'm impressed that you managed to do your homework without being told!
Wow, you did your homework without being asked! I'm impressed!
「言われる前に宿題やって偉いね!」＝ It's great that you did your homework without being asked! / I'm impressed that you managed to do your homework without being told! / Wow, you did your homework without being asked! I'm impressed!
ボキャブラリー
great, I'm impressed ＝ 偉い
homework ＝ 宿題
managed to do ＝ ～ができた
without being asked/told ＝ 言われないで、言われずに
イギリス 
