Bai tu is your sister instead of brother.
. 如果H1在回美后批准,我是不是还算H1 status(即H1有效)?
yes
2. 如果H1在回美前批准,我是不是就不是H1 status, 而是AOS? 这时批准的H1还有效吗?
If you are in pending for 485, you are AOS. H1 is ok.
3. 接问2. 如果是AOS, 我将来还有可能回到H1身分吗?
Even you are in AOS, you are still have a H1B visa