If your TD visa sponser is your spouse or your parent who has TN, when he switches to H1B, you can apply for H4 to stay in US. If you want to go back to Canada or China, just go ahead. It should not have any negative impact on your future visa application.
Did you have big fight with your sponsor? Don't worry, everything will be fine.
Did you have big fight with your sponsor? Don't worry, everything will be fine.