YOU SAID:
The teacher was tired so she didn't grade the test
INTO JAPANESE
彼女はテストを採点しなかったので、先生は疲れていた
BACK INTO ENGLISH
The teacher was tired because she did not score the test
INTO JAPANESE
彼女はテストを採点しなかったので、先生は疲れていた
BACK INTO ENGLISH
The teacher was tired because she did not score the test
You've done this before, haven't you.