Bazf.....see attached from the USCIS site, it clearly states the test will be carried out in English, the only non US born exceptions I know of are filipinos who served in the US forces during WWII .
http://www.uscis.gov/graphics/servic...z/natzsamp.htm
quote....SAMPLE SENTENCES FOR WRITTEN ENGLISH TESTING
To be eligible for naturalization, you must be able to read, write, and speak basic English. The sentences on this page are examples of the types of sentences an USCIS officer may ask you to read aloud or write during your interview. They are not an exhaustive list. The USCIS officer who interviews you may ask you to read or write other sentences.