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8老師您好，

我現在的情況是“H1B is anticipated on August 1". 這是不是意味著我的H1B是這天才生效。在八月一號以前，我的身份還是F1？

-Yes.

我先申請了OPT。 這也意味著我先生持F2簽證必須在八月一號之前離境。

He can file change of status from F-2 to H-4 during your H-1B pending or before your H-1B is effective. Thus, he can stay in US legally.