http://en.wikipedia.org/wiki/H-4_visa
Family members may alternatively be admitted in other non-immigrant categories for which they qualify, such as the F-1 category for children or spouses who will be students or the H-1B category for a spouse whose employer has also obtained approval of an H-1B visa petition to employ the spouse. An H-4 visa holder is admitted to the US for the duration of the primary (H-1B, H-2A, H-2B, or H-3) visa validity.[1]
Since H-4 visa holders are not issued a social security number, an ITIN (Individual tax identification number) should be obtained before filing for joint tax returns by filing Form W-7. They are not authorized to work in the United States, though they are allowed to study.
根据以上所述，你不能做自由翻译，但你可以去找工作。找到工作后，你就可以申请把签证改为H-1B。但是你得注意，即使你找到工作，也不能马上去上班。你必须得先申请H-1B，否则还是属于非法工作。哪怕你只是非法工作一天，以后找工作或申请绿卡时也会有麻烦。至于是否等移民局接受你的H-1B申请后（而不是等批准之后）你就可以马上上班，你得查一下现行的法规，或向律师咨询。
如果你想读书的话，可以等学校录取之后申请把签证改为F-1，等毕业后再找工作。在美国找工作，通常雇主要求申请者有美国或其它国家 "accredited school” 的学位证书（当然不是唐先生那种可以“复制”或“复印”的“学位证书”
）。
以上建议仅供参考。Good luck!
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