>A non-native speaker once asked me why we say "Going overseas" instead of "Going to overseas". I couldn't give them an answer at the time(even though I'm a nat

>A non-native speaker once asked me why we say "Going overseas" instead of "Going to overseas". I couldn't give them an answer at the time(even though I'm a native speaker). >Later I asked a very smart friend of mine who studied english as a second language (and was quite proficient at that point) and he was immediately able to recognize that it was because "overseas" is an adverb. It seems obvious in retrospect, but you just don't think about those things as a native speaker. What about 'Going bananas' -- is that still an adverb?