1， 上个月刚递交了 I-485 就不能再去办新TN了， 现在去B公司用去年申请的TN 可以吗？
-Do you mean you got the TN I-94 at the border from your last entry based on Company B sponsor, and then, you did not work for Company B, but worked for Company A since then? If so, you have violated the TN rule and worked illegally since then.
2， 我孩子的TD 签证 是现在的 A公司， 如果我去B公司的话， 我孩子的TD 身份还有效吗？
-Yes if your TN is valid.
她当时没有办B公司的TD
3， 是不是我当时办了B公司的TN后， A公司的TN就失效了？ 那样的话我这一年在A公司上班就不合法了。
-Yes if you only got the TN at the border from your last entry. You only can have two TN at the same time by this way: at least one of the two TN is obtained within US through the employer filing I-129. You cannot got two TN at the border. I suggest you to consult an immigrant lawyer as soon as possible.
悔不该当初没有多方咨询， 考虑不周才有如此麻烦。
情况有点儿复杂， 烦劳8老师费心赐教， 谢过啦先
