Do I need to purchase tround trip ticket if my study will last 20 months?

You are not required to do so but it might help you obtain the visa by demonstrating intent to return to your country, meaning you have no intent...

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Citizenship

Unfortunately there is no way any of the accomplished immigration attorneys on this site can help you from afar. The ball is in your court now:...

What steps are available for a married w/child deportee now and/or in the proposed immigration reform legislation?

I agree with Mr. Thomann's excellent advice.

I am a F-1 student currently applying for green card through marriage. Do I need to submit copies of my I20 together with I130?

It is not needed for the I-130 but it can later help you establish that you were lawfully admitted to the US.

What documents can I use to provide evidence of eligibility when filling for I-485 adjustment of status (F1 to green card)?

If I were you I'd hire an immigration attorney to prepare the application.

Yes.

Will I have problem when I return to the US?

Should be fine.

Can I claim US citizenship? Deriative Citizenship

It sounds as if you have potential to qualify.

6 months after interview but nothing from immigration. My work permit expires October.my driving license got today expires Octbe

I sympathize with your situation. Dealing with USCIS timeline can be thoroughly frustrating. Hire a local immigration attorney to investigate the...

How do I get my wife to be able to work, and have a SS number in the US.

Not enough information to give good advice - are YOU a US citizen? Are there children involved? Does she have a criminal record? Best to sit down...