What is the crowd's opinion of Grammar Checker Academic?

From 3.5 billion comments

I'm not the one who downvoted you, but if you have a source to back up your claim I'm all ears.

http://www.grammar.cl/rules/present-tense-vs-past-tense.gif

Edit: AFAIK, past participle applies mostly to "have", "haven't", "had", "hadn't", "has", "will have", "would have", etc instead of the forms of "do"

Edit2: There's also online grammar checkers such as https://www.nounplus.net/grammarcheck/ which will show the same correction, there's no need to be salty about being wrong, everyone makes mistakes...

I'd like to know if I'm wrong or not...

Here is a site that confirms that I'm right.

https://www.nounplus.net/grammarcheck/

I would suggest doing some research before you try and correct other people in the future.