請教：1。現持H4 簽證，到明年九月過期。 如果無任何變化， 明年九月需續簽？ 到Border 就行？
-Either is way is OK if you ar ea Canadian citizen.
2。明年一月有一臨時工， 需要去Border 辦TN visa, 是否拿到TN， H4 就自動無效了？
-Yes. You only can have one status at one time.
3。 主申請在辦理PERM，若幾個月後批準， 是否隻有 當時拿 H4 才可以file EAD？，
-If you mean you are qualified for H-4 EAD, then you have to have H-4 status to apply for it.
拿著TN可否file EAD？
-No for H-4 EAD.
4。 如果上述任何一個成立， 是否需要申請在TN 和 H4 間轉換 ， 如何辦理？
-You can go ot the border to get a new status (H-4 or TN), or file I-539 to change status within US which may take 3 months to get the new status within US.
