我的情況很一樣，F1進來，換成H1，我沒有用過這個form I120，相反，我的律師給了我一個sample letter，如下。我就用了這個證明我的employment 情況,是我的老板自己簽的字。我的485已經批下來了。Good luck.
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COMPANY LETTERHEAD
DATE
Immigration & Naturalization Service
Regional Service Center
RE: Confirmation of Employment
Dear Officer:
This letter seeks to confirm that ___________ is presently employed in this office serving in the full time position of __________ earning an annual salary of $____________.
Please feel free to contact me with any further questions.
Sincerely,
(boss name and title)
