Yes.

要提前多久提交文件？
-Had better file N-400 maximum no later than 6 months after the green card expires.m Otherwise, you need to renew your green card.


還有，在審批期間（如果綠卡過期）還能工作嗎？
-Yes for your current employer, but you may not work for a new employer because the new employer normally wants you to show your valid green card.

如果入籍時間太晚（年底就過期了），申請綠卡要提起多久？申請期間（如果綠卡過期了，新的還沒有批下來）能工作嗎？
-Same as above answer.

謝謝大家！