1. I am currently working with EAD (NIW I-140 approved in 2008). So in I-140 form, Part 3, If in the U.S., "current non immigrant status" should be "Adjustment of Status",
-Yes.
and the Date of status expires should be the expiration date of EAD, am I correct?
-No. Put "N/A".
2. Part 4, 6, Has any imigrant visa petition ever been filed? Even though my previous I-140 has been approved, I still need to attach a separate sheet to provide the case number office location, date of decision, am I correct?
-Say "No" to Q4 if you do not file I-485/EAD/AP with this Eb1a I-140 and say "Yes" to Q6.
Suggest you to read:
"Disposition of the decision" means the approval notice, is this right?
3. Part 4, 7, and 8, questions related to labor certification, becuase I am filing EB-1a, I should check "No", is this correct?
-Correct.
4. My hu*****and is now working with EAD too. So Part 7, Item "Applying for adjustment of status" for my hu*****and should check yes or no? I think I should check yes, but not sure about it because he already has EAD. Please help me with this too
-Correct.