They certainly do, in fact the way I implemented bunpo-check is a part of speech tagging problem
(by which I mean token-level classification); I assigned labels of 0 for unimportant tokens, 1 for correct tokens and 2 for incorrect tokens which is not dissimilar to assigning a 0 for verbs, 1 for nouns etc. This type of thing is really easy with the huggingface API, when I get a minute to clean up my code for the model training I’ll put it on the github and you could probably just use the same setup. So yeah, as long as you have a large enough dataset, making a part of speech tagger should be fairly simple.
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Very cool project, as I software engineer myself I’m a bit jealous that you put this together before I had the chance to! Seriously though, great work and thanks!
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Don′t know if this is along the lines of what you were thinking, but imma leave this here → https://ichi.moe/
it’s a vastly underappreciated website, tbh
using this in conjunction with @gilledtothegills’ site to check my work has been a blast. Inputting my sentences that have turned up /incorrect/ on 文法check into the ichi.moe tool has taught me quite a bit about what not to do and which forms to avoid, etc.
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Update 
A big update which has been a long time coming! Starting today, 文法ーCHECK now offers suggestions for fixing your sentence.
After hitting check, underlines will appear under any mistakes. Tap an underlined section to see the suggestion for fixing it.
Note that this is still a work in progress and might give incorrect results as always. 
Any and all feedback is welcome. I’m going to continue to work to make the accuracy better and better over time.
Thanks for everyone’s support until now! 
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How does it compare with using ChatGPT?
Amazing tool! I checked a few sentences and it detected minor details and correctly suggested how to fix them.
Thank you so much for your excellent work. I hope more people get to know it, as it is proving so useful.
In the future, it would be interesting to have some feedback on why something is wrong/better, such as a grammar explanation linked to the underlined section.
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So awesome to see updates like this nearly 2 years later!! Will take it for a spin later and see how it is, congratulations though nonetheless~~ 
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I am learning Japanese right now, and this website is a lifesaver when I’m stuck on something confusing.
Will there be a dark mode? It’s a bit too bright for me.
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This is such a cool idea! I’m looking forward to using this. I still struggle with output and I feel like this’ll be a godsend and allow me to better use my teachers’ time! Thank you for continuing to work on it!
This has been a useful tool for me, thanks. I actually put through a mini-essay that I wrote myself and was already checked by a native Japanese speaker for errors and honestly, I think it now throws back too many suggestions so that the authors voice becomes lost. Not saying what I wrote was literary masterpiece, but it was grammatically correct and natural. However, this suggested changing a lot of things like ～たほうがいい to べき and suggested removing はず entirely.
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Using GPT models / openAI API or something else?
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