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Hi Teacher 8, I entered in US with B2 but did not get I-94 on the airplane. Where can i get it?

-There is not paper-type I-94 anymore, and it is eletronic. If you want to extend your B-2 status in US or change B-2 to another status or apply for green card, you can print your I-94 at this website:

https://i94.cbp.dhs.gov/I94/consent.html;jsessionid=g82rWLPbTFbsb8mpQQv5TF2r4c6n65v1PvgKcLPnV23F5hWT78vm!-350798883

I got 6 month legal stay, when i fly back to china, do i need to submit my I-94 at the airplane,

-No. Just show your passport to the Airlines.

or INS automatically know my return date because the airplane reports to them my departure date?

-Correct.

 Thank you for your help.