YOU SAID:
I did not go to school yesterday because I puked 4 times
INTO JAPANESE
昨日学校に行かなかったのは、4回4ったからです
BACK INTO ENGLISH
The reason I didn't go to school yesterday was 4 times 4 times
INTO JAPANESE
昨日学校に行かなかった理由は4回4回だった
BACK INTO ENGLISH
The reason I didn't go to school yesterday was 4 times 4 times
You've done this before, haven't you.