就要去美国工作，有几个问题：
1。TN持有者是否可以申请绿卡。以前看到是不可以的，但是请看以下文字：
Question 8. Will my Green Card application cause trouble when I renew my TN?
Anwser: No. Not if you plan your strategy.
Thanks to the wonderful "doctrine of dual intent," you can have both the intent to remain in the U.S. on a temporary and permanent basis---at the same time. (Who said law isn't flexible!) Therefore there's no problem having a green card application pending while you are renewing your temporary TN status.
The regulation for L-1's and H-1's state what you need to show if you are renewing your permit and have a permanent application pending. To be safe, you should be prepared to show the same things for TN renewal.
This dual intent doctrine is in the regulations for L-1 and H-1 permits, but is not written anywhere for TN's. Right now, the INS generally treats TN's under the same doctrine. This could change.
引自：http://www.hansen-company.com/faq_us.html#q8
从上面的文字看好像可以以TN申请绿卡。请高手指点
2。我夫人的身份将是TD，她还具有加拿大移民身份（持有枫叶卡）。请问她可以申请其
它种类的工作签证吗？什么签证是最好的？我是说可以比较快的办下来？是否需要雇主的
资助？
谢谢回答！