Yes, to change your status while in the U.S., you must file a request with USCIS using the appropriate form before it expires. You are eligible to apply if you were lawfully admitted into the U.S., have maintained your current visa status, and not committed any legal violations. The process typically requires submitting Form I-539, Application to Extend/Change Nonimmigrant Status, along with supporting documents that justify your request. If applying for a change of status to an employment-based visa, your prospective employer may need to file Form I-129, Petition for a Nonimmigrant Worker, on your behalf. Not all visas, however, are eligible for extension or a change of status. Those on immigrant visas, for example, are not able to be extended. Additionally, even if you apply for a change or extension, your stay is only considered legal while USCIS processes your application. If your request is denied and your original visa has expired, you must leave the U.S. immediately to avoid unlawful presence penalties.