and you appear to need to complete this form: http://www.irs.gov/pub/irs-pdf/f2555.pdf
in order for them to determine whether you are entitled to any exemptions.
I have never filed taxes myself. But would like to learn a few things, since my husband is now working in Hk and is a citizen of US. First of all, when are the tax forms due, in HK? Secondly, what are the things that an expat needs to be careful about?