I think the biggest advantage of being bilingualism is it helps to training my brain and my memory, with an others words, when I speaking with English-speakers, my brain is turning to "English thinking mode" (Thinking as an English-speaker to make sure I'm using a right pattern so people could understand) and keep recall the English words to complete a sentence. Speak a foreign language is requires me to keep response (processing translate) fast which training my brain, and keep remember new vocabulary I've learned to expanding my memory. It's very hard when I just getting started to study my second language-English, because it's very different from Chinese, so it's not help when I'm trying to study English by using a "Chinese thinking mode" but making errors in grammar. Yet, I found out I forget a lot of Chinese vocabularies just after I came to America about half year, I already used to speaking English in my daily life and I even have to using English to instead Chinese words because I really can't recall them sometimes, which is called retroactive interference In Chapter 7 (occurs when learning something new hampers earlier learning). I'm learning French this semester, because French is similar with English, it helps me a lot to learn faster than when I'm using Chinese to study English, which represents another interference: proactive interference (occurs when earlier learning gets in the way of new learning). but there are also some retroactive interference going on (I always confused by those similar words and using French word in English or opposite). To know three different languages is the limit of my ability, because human's memory has a limit, we can't keep absorbing new information without forgetting old ones. But if we aren't trying, we never know where our limit is.