Why was "You are bigger than I" marked wrong. "I" is the correct word in English grammar because the full sentence would be "You are taller than I AM," but for the fact that the word "am" is assumed. And "bigger" is a correct definition of "grand" every other time I've used it with Duolingo.
You are taller than me is not good English, it should be I (Which is accepted) If you add the full expression, which is rarely used, with am following, it makes 'You are taller than me am' nonsense, where as 'You are taller than I am' is what it should be. me is commonly used but is not correct.
There are so many correct answers here about "You are taller than me" vs. "You are taller than I!" I really hope this gets fixed, Duo is getting better grammar everyday! (and hopefully you too) I think we can almost all agree that "I" is correct here because if you used the whole sentence with "me," "You are taller than me am" just does not sound right. If you don't agree, give me a thumbs down.