H4 to F1 COS pending and H4 slated to expire

It is best that you consult an attorney privately for a comprehensive evaluation of your case.

In regards to Affidavit of Support can one file taxes to join their immigrate spouses income to theirs?

you should get a co-sponsor. Make sure that the co-sponsor meets the federal poverty guidelines. good luck.

I got married to a LPR in Ohio in 2011 and shortly after I started seeing his ' true colors'

You can try VAWA but you absolutely need an attorney to assist you. VAWA cases are hard enough when there is ample evidentiary support let alone a...

Green card holder but travels a lot. After biometrics can I travel?

Although your LPR status should be fine, you will have serious issues if you plan to become a USC. Unless you fit one of the exceptions, you should...

Spouse visa issue - Middle Name extra on the i-130

When you complete the I-130 application, you are asked to include all aliases.

Change embassy location (H1B visa)

You should contact USCIS and explain your situation and ask them if you could change embassy location for the interview.

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Immigration

Were you LPR when she became citizen? If yes why did you not become citizen at the same time?

J1 work Visa for student in CEGEP/College in Montreal?

There should not be any problem. However, you should contact the company's attorney.

If my work will apply for an H1 visa for me, can I apply for an H4 visa for my spouse at any time?

You do not have to apply for H4 for your wife at he same time.

If I apply for Green Card EB2 category , how long do I need to maintain my non immigrant visa if staying in US ?

With 3 complicated questions, I would suggest you consult your employer's attorney.