Can you leave the US before I-94 expiry, and reenter the US, while a I-539 is pending?

Because your husband has shown immigration intent he will likely not be admitted back into the USA on a non immigrant visa.

Can I get married to someone who has a B1/B2 visa ?

You are free to marry anyone you like - including a person on a non immigrant visa -so long as the two of you meet all other requirements for...

Sorry for the situation. Your wife is not eligible to apply for any immigration benefit for 10 years.

how can I expunge the DV record ?

An expunged record does not help you for immigration purposes. Yu must still disclose the arrest disposition and any sentence. My suggestion is...

My mother is a Permanent resident applied for my immigration in 2012 but died here in US

My colleague has provided you with excellent advice.

B visa application for parents with their son being in the USA ?

The questions asks for ALL relatives in the USA. You are a relative in the USA.

Can I apply for B2 visa when my F1 visa is still valid?

You must choose between one of the visas. Employment is not allowed while on a B visa.

Is it too late to file form I-539?

I suggest you speak with an experienced immigration attorney about your personal situation and possibilities. There are special rules that apply to...

Is my son elegible to become a us citizen ?

As an adult your son is no longer considered an immediate relative and an immigrant visa is not immediately available to him. Only if you became a...

How can my wife and I get a work authorization in the United States?

I suggest you discuss your options with an experienced immigration attorney.