IF I applied for F1visa in a US embassy at home and it got denied , can they cancel my valid B2 visa?

Yes, they can.

Legal date to start work in case of H4 to H1 transfer

Technically, yes, you should have waited until you had the notice.

Length of stay outside USA

Depends on what status you have in the US. The Court of Appeals for the Fifth Circuit has stated that "federal immigration laws are exceedingly...

Hi, my boyfriend is illegal in us and i am citizen we both want to marry what can i do?

What needs to be done after you get married depends on how he entered the US, among other factors. The Court of Appeals for the Eigth Circuit...

My new green card has the wrong birth date on it and I would like to know if,I have to fix it before applying for citizenship?

Yes, it needs to be corrected.

Can I change my visa statut 1 week after have my visa , in Canada instead of go back in my country ?

You will need to contact the US Embassy in Canada to see if they will process you.

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Is it possible to transfer family based F4 petition to family based F1 category?

No. Your father will need to file new petitions with new priority dates.

.Right now I have only work permit.What is Current Immigration Status for me??? It is E.A.D. or N/A .

Out of status, applying for adjustment of status.

Change of status from B2 to F1. Will extending B2 visa affect the chances of getting a F1?

Extensions of a B-2 are not only not guaranteed, but are difficult to obtain. Best plan is to go home and apply for the F-1 visa stamp there.

1. petition denial 2. Only if he was denied a visa stamp. The Court of Appeals for the Seventh Circuit recently stated: "The Immigration and...