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One day, my co-worker left my company. It was surprising and I was very worried. Because my team members didn't know about his task. I had to call him but he didn't answer. So I had to find his old reports. I had to study his task with my team members. finally, we could solve some problems. After this case, we always keep our reports.

Hello [이름]!   Now this what I call a fine job! Remember that the word \'then\' in the expression \'since then\' refers to a specific point in the past (which has already been mentioned, probably in a previous sentence). \'Since then\' is typically used with the present perfect simple or the present perfect continuous:\"Cesar has helped many businesses since then.\" (Note the word order.)   Teacher Venus^^   One day, my co-worker left my company. >>>CORRECT It was surprising and I was very worried. Because my team members didn\'t know about his task. >>>It was surprising and I was very worried because my team members didn\'t know about his task. I had to call him but he didn\'t answer. >>>CORRECT So I had to find his old reports. >>>CORRECT I had to study his task with my team members. >>>CORRECT finally, we could solve some problems. >>>Finally, we could solve some problems. After this case, we always keep our reports. >>>We always have kept our reports since then.