第一，若不幸被裁，有多久的合法時間可以用來找下一份工作，
In this case, you only lose your H-1B, unless you immediately find another job after lay-off and file another H-1B without gap. If you do lose your H-1B, you still have AOS that is a legal status for you during 485 pending, but you cannot later get back to any nonimmigrant status (such as H-1B) again.
第二，若找不到新工作，是否將要失去合法身份，
No. You have the legal status of AOS. The adjudication of 485 says you must prove your willingness and accessibility to the job listed on your LC and 140, or a similar job, upon approval of 485. You don't need to work at all to keep AOS. And you don't need to work for that position if you change your mind after adjudication, because it's natural people change mind every moment and USCIS cannot force a person to keep mind unchanged the next day after adjudication which is anti-humane, unless they explicitly impost such restriction as a condition which is extremely rare. Even in this almost impossible case with a conditional approval that I never heard of, if you change to a similar classification of profession which is the case for most job switchers, right after or even at the moment of approval, you satisfy the 485 approval requirement according to 140 portability after 180 days of 485 pending.
第三，有沒有什麽其它什麽Legal 渠道可以保留我的合法身份，我的H-1B明年初6年到期。
As above said, you have the legal status of AOS. You can also continue H-1B if you file another one without gap.
D第四，可否用EAD從事別的類型的工作直到I-485獲批準。
Of course, you can use EAD to do any work or do no work at all. But you need to have the same or a similar position available at the time of your 485 adjudication if you still want that approved.
In this case, you only lose your H-1B, unless you immediately find another job after lay-off and file another H-1B without gap. If you do lose your H-1B, you still have AOS that is a legal status for you during 485 pending, but you cannot later get back to any nonimmigrant status (such as H-1B) again.
第二，若找不到新工作，是否將要失去合法身份，
No. You have the legal status of AOS. The adjudication of 485 says you must prove your willingness and accessibility to the job listed on your LC and 140, or a similar job, upon approval of 485. You don't need to work at all to keep AOS. And you don't need to work for that position if you change your mind after adjudication, because it's natural people change mind every moment and USCIS cannot force a person to keep mind unchanged the next day after adjudication which is anti-humane, unless they explicitly impost such restriction as a condition which is extremely rare. Even in this almost impossible case with a conditional approval that I never heard of, if you change to a similar classification of profession which is the case for most job switchers, right after or even at the moment of approval, you satisfy the 485 approval requirement according to 140 portability after 180 days of 485 pending.
第三，有沒有什麽其它什麽Legal 渠道可以保留我的合法身份，我的H-1B明年初6年到期。
As above said, you have the legal status of AOS. You can also continue H-1B if you file another one without gap.
D第四，可否用EAD從事別的類型的工作直到I-485獲批準。
Of course, you can use EAD to do any work or do no work at all. But you need to have the same or a similar position available at the time of your 485 adjudication if you still want that approved.
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