COLOUR CODE:
red highlight: means your sentence is not correct. (language accuracy/control)
yellow/orange highlight: means it doesn’t sound right somehow; it’s not terribly wrong but not right either (there might be a problem with language accuracy/control, or perhaps it is "correct", but it sounds contrived/not natural/it may not be used very frequently).
blue highlight: your sentence is right, but I’m suggesting another possible alternative. (This will help you widen your language range, or perhaps the alternative sounds better/more natural/more appropriate).
green highlight: I do like it! Well done!- it shows your language range, and it is used appropriately.
pink highlight: it's not original/not your own material: it has been copied literally/mostly taken from other sources/plagiarised. (mediation tasks: it's been copied literally from the source text)