YOU SAID:
dave was went shot all his co-workers while working
INTO JAPANESE
仕事中にデイブは同僚全員を撃た
BACK INTO ENGLISH
Dave shot all his colleagues while at work
INTO JAPANESE
仕事中にDaveは彼の同僚全員を撃った
BACK INTO ENGLISH
Dave shot all his colleagues while at work
That didn't even make that much sense in English.