Okay, so obviously it chokes on sentences that need intelligence to parse. No surprise here.
And English grammar is delightfully ambiguous, anyway.
But I seriously distrust any algorithm that yields incorrect results on the example input.
Look at that default sentence: “You can type anything here to visualize its grammatical structure.”
It says “here” is an adverbial modifier to “anything”. That does not make sense. Note that “You can type anything here.” is analyzed correctly, with “here” modifying “type”.
Also, I dislike how it analyses the sentence “I cannot sleep”. It says “not” modifies “sleep”, as if the sentence meant “I am able to not sleep.”
