再问一下，如果走加急，LD的H4和我的H1B延期很快批下来，但在八月生效前又找到了新的H1B，这时H4就自动失效吧？
-His/her H4 is valid immediately when it is approved even if before your new H1 is valid (his/her H4 is depends on your H1 status, not your extended h1 approval). So, if he/she find a job after the H4 is approved, just change the H4 to H1 again.
如果是H4 pending过程中先找到了H1B，然后H4又批了。这样后面生效的H4会冲掉H1B吗？
-Yes, so he/she has to choose either to change the h4 to H1 again or just to go outside US to get the H1 visa to come back.
主要在想要不要自掏腰包办加急。LD转H4也是无奈之举。现在工作压力太大，连骑驴找马都没功夫。否则直接H1B转换最省事了。
