I am in a project management role. One of my project team gets involved in writing reports which I review. Their writing is generally perfectly understandable, but the way they write makes it very obvious they aren't a native speaker - incorrect grammar mostly. We work for a professional services company and some of the reports end up in the public domain, I can't allow writing that bad to be issued with the company name on.
The colleague is quite new and is writing their 2nd report. For the first one I didn't say anything about the grammar because we ended up restructuring the whole thing on a tight timescale (not their fault). This time I think I need to say something because I am having to rewrite every single sentence.
I've only dealt with this issue once before and that colleague raised it herself - she was very aware that she needed to improve her English and writing and signed up for courses in her own time as well as asking me for "track changes" feedback.
This colleague seems unaware of the issue - does anyone have advice how I can raise this tactfully? If I track changes on the report (as I usually would) there will be more red than black, and I know it's a bit depressing getting a report back in that state (been there, done that!).