Y - 回复：请教：我的H1已过期，延期尚未批下来，请问我太太可否转申请H4?谢谢。

I-539, Item 3 of Part 3

http://blog.wenxuecity.com/blogview.php?date=200709&postID=147#I539

Until your I-129's been approved
1) her I-539 may not be approved, and
2) she may not apply H-4 visa outside US