-After you lose your job, technically your H1 status is invallid and you are out of status. But you still are lawfully present and look for job until your H1 I-94 expires. The problem is that if you are out of status > 180 days, you can not file your I-485 in the future (your I-485 will be denied if you file it). So, you need to go out of U.S. to get a visa to come back if you find a job or want to change of your status.
(2)另外,如果我在三月一日之前找到工作然后做h1b transfer,会有一个GAP,这个GAP会影响我的h1b transfer吗?
-USCIS usually approve your H1 transfer if the gap is less than 3 months with the I-94. If the gap is > 3 months, USCIS usually approve your H1 transfer without I-94 and thus, you need to go outside US to get an H1 visa to come back to activate your h1 status.
(3)如果我是三月一日以后找到工作,比如说三月中旬或者是四月份,那时我的h1b是out of status,那样的话对我的h1b transfer的影响有多大?
-see above answer for Q2.
(4)在out of status的情况下(I-94 still valid)我最多能够在美国停留多长时间去找新的工作?
-see anwer for Q1.
先在这里万分感谢862311对我之前问题的回复!!!