Quote by LordCephius
Grammarly will flag any sentence that starts with the word This.
Interesting. I've written for a few places with strict style guides in my time, and one in particular had editors who flagged my use of "this". I was told that starting sentences with This, or using this without any further clarification, adds cognitive load (or somesuch) to the reader who has to remember what this refers to. It also breaks SVO by having the subject/object in another sentence.
I'm not a Grammarly (or any checker) user but I'd be interested to know if the following passages are flagged. Version one uses "this" without any object:
The log files will be scanned for configuration settings and other metadata. This can take a few minutes for very large files.
And version two uses "this" with a qualifier to remind people of the object:
The log files will be scanned for configuration settings and other metadata. This verification process can take a few minutes for very large files.
To me, as a reader, I think the immediacy of the first one is still clear. There are no actions in the previous sentence other than "scanning" to which the object could be attached, and the sentence is short enough to fit in most people's working memory without losing flow.
I guess the second one could be shortened to "This process", which is perhaps better, and still attaches "this" to the action of scanning. It's more correct but I'd argue any of the above work.
This (situation, haha) is probably one of those scenarios where breaking the rule is okay if clarity is maintained, but Grammarly may not grasp the nuances of language with its strict built-in rulesets.