Not everyone with a visa is eligible to apply for an extension of stay, clarified, input, usa.gov. “You can apply while you are in the United States, but as long as it is before your permission to remain authorized on your I-94 (form) expires.”
From the website of the United States Citizenship and Immigration Service – USCIS – they explain that “if you want to extend your stay in the United States, you must apply to USCIS with Form I-539, Application for Extension or Change of Status of No Immigrant before their authorized stay expires.
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In which cases the extension of the stay in the United States is requested
You can request an extension of your stay if:
… Staying longer than allowed may result in your visa being revoked or jeopardize your ability to enter the United States in the future. If you are unable to depart on time, you may request an extension of stay from USCIS https://t.co/oik0qja1Mm
— US Embassy, Venezuela (@usembassyve) February 23, 2021
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In which cases is no extension of residence in the United States requested?
You cannot request an extension of your stay if you have been admitted to the United States in the following categories:
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What is the process to extend your stay in the United States?
The first thing to check usa.gov is the list of situations in which you can or cannot extend your stay in the US.
Then follow the next steps:
• Apply for the extension online or by email.
• Calculate the fee you have to pay (in English) for the procedure. Choose Form I-539 (Select a form) from the drop-down menu, then select your current non-immigrant status from the drop-down menu (Current Non-Immigrant Status).
For more information, see the USCIS website, here
With information from USCIS and usa.gov
Source: Eluniverso

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