Would it be considered poor manners or copyright violation if I post a homebrew mission in the forum, using many sentences directly from the game's missions? For example, the "ending a scene" part of the Crossfire mission is perfect as it is for my needs and I just want to copy-paste it for sake of simplicity. Also, I am not a native english speaker and it would save me a lot of headaches lol.
I know copyrights can be a delicate issue, so I would understand if this is a problem.