幾個N-400填表問題請教 - 移民

幾個N-400填表問題請教:

我 08/20/2008 綠卡核准，理論上 05/22/2013可以遞件N-400。
而我應該會於 05/22/2013 當天用 USPS certified mail w/ return receipt 寄出。
現在不懂 N-400 part 7:

Part 7.
A. How many total days did you spend outside of the United States during the
past five years?
B. How many trips of 24 hours or more have you taken outside of the United
States during the past five years?
C. List below all the trips of 24 hours or more that you have taken outside
of the United States since becoming a lawful permanent resident.

Part 7. A和B都是問 "during the past five years"，
所以我是應該以填表時 (05/22/2013) 往前推五年嗎？
因為剛好 06/03/2008-06/17/2008在台灣度假，所以以05/22/2013
往前推五年的話我應該把2008六月那個trip算進來。

但Part 7. C要的是 "since becoming a lawful permanent resident"，
所以C的詳細出入境日期就不會算到2008六月那個trip。

若是照我理解的來填，7A,B和7C會兜不起來，我需要另外附上說明嗎？

N-400的instruction和M-476沒有解釋。版裡爬文也沒有類似的情況。

另外我後來台灣有辦電子通關，所以後來這幾趟往返台灣已經
沒有台灣的入出境章，不知到時移民官會如何核對歷年出入境紀錄？

謝謝大家。

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