回複：several I-485 file question, ask XIAOBAITU AND experts

1. for myself,
Do I need to attach my wife's W-2 except my W-2?
NO. ONLY YOURS.

2. for my wife,
Do I need to attach my W-2 except her W-2?
NO.

Do I need to attach my passport copy?
NO. HER PASSPORT AND ALL DOCUMENTS SHOWING HER LEGAL STAY.

Do I need to write a cover letter for her except my employment verification?
ONE COVERLETTER IS ENOUGH.