YOU SAID:

Yesterday, my brother broke the window and didnt bother fixing it.

INTO JAPANESE

昨日、兄が窓を壊して、直してくれなかった。

BACK INTO ENGLISH

Yesterday, my brother broke the window and didn't fix it.

INTO JAPANESE

昨日、兄が窓を壊して直さなかった。

BACK INTO ENGLISH

Yesterday, my brother broke the window and didn't fix it.