I am a greencard holder married to a Filipino citizen. I filed an I130 form in February 2011 so my husband can join me in the US. I received an I797 notice of action in Sept. 2011 instructing me to file either an I485 (if I am in the US) or an I824 form (if outside the US). Can my husband travel to the US (using his valid tourist visa) to file the I485 form and stay in the country while the form is being processed? Would it be better to just file the I824 form and let him wait in the Philippines?