Please check the following paragraph. Is it acceptable?
Your report on a special topic is excellent in both pictures and literary compositions. It's beyond my capability to mark corrections. However, is it written by yourself, or copy from someone else's thesis on the Internet?
The "however" doesn't belong. There is no relation between your inability to correct it and its origin.
You want to know whether it was "copied." "Written" is past tense and "copied" is as well.