Bai tu is your sister instead of brother.
. 如果H1在回美後批準,我是不是還算H1 status(即H1有效)?
yes
2. 如果H1在回美前批準,我是不是就不是H1 status, 而是AOS? 這時批準的H1還有效嗎?
If you are in pending for 485, you are AOS. H1 is ok.
3. 接問2. 如果是AOS, 我將來還有可能回到H1身分嗎?
Even you are in AOS, you are still have a H1B visa