Can a person with their first H1B petition still in processing, work with their employer from the person's home country?

Yes, US immigration laws do not affect someone working outside of the US.

You can but if the COS gets denied then the I-485 is likely to be denied as you would need to be in a valid status at the time of filing.

Unfortunately you cannot file the I-485 and port to a new employer without re-doing the PERM/I-140. Had you filed and I-485 with employer A and...

Is the last day of staying in the US determined by the date on I-94 or date on visa?

Your authorized stay is determined by the I-94. The validity of the visa determines when you can enter the US but does not determine your stay.

Yes, you can sponsor her by filing an I-130 under the F-2A category. As the dates are current under the visa bulletin she can also file the I-485...

Yes, the visa has nothing to do with your stay in the US. The purpose of the visa is to gain entry to the US. As long as her application remains...

What is the procedure to get married with an American citizen?

You will need to file an I-130 and I-485. However, filing for a green card when here on the visa waiver program (ESTA) requires you to be aware of...

What is the process to apply for H4 in USA?

You will need to file Form I-539 to change status from B-2 to H-4, however this application will depend on your current extension getting approved.

If your priority date is not current and therefore you cannot adjust your status it makes sense that you would need to transition from an F-1 to an...

Every Attorney will have a different answer for this. Unfortunately substantial is not defined. It depends on the nature and overall cost of the...