If the parser isn't sophisticated, it will misdiagram the sentence and won't know the difference between verb and subject.

I went upstairs and Joseph, my husband, he came upstairs and found some boo boo on the floor. My little girl boo booed on herself downstairs as I was getting ready to clean her up.

A precise definition of diarrhea is elusive

But Mandarin is the bigger language anyway, not many other parts of China speak Canto.