You can file the I-765 with the I-485 Adjustment of Status application. The USCIS website states that "...you may file these forms together. If you choose to file the I-765 ... separately after July 30, 2007, you must also submit a copy of your I-797C, Notice of Action, receipt as evidence of the filing of an I-485."
It is also important to note that no additional fee is required to file a I-765 with a I-485 application (which was filed on or after July 30 , 2007)
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J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.