H1 B transfer when in extension

[sujatha29]

I'm working for company X. My H1-B is expiring in a month. Extension is applied, received Acknowledgement and extension is yet to be approved. 

1) Can company Y hire me by transferring my H1B even before it is approved?

2) If I resign now (before I get the extension approved) and decide to go back to native country for few months, what happens to the Visa. Will it still be usable at a later point?

3) If I decide to take a break and continue to stay in H4 as my spouse's dependent for a while, how difficult it is to get back to work by reviving my H1-B? Can both H4 and H1-B be valid at same time?

4) If I need to go to native country for a vacation, can I still come back even if extension is not yet approved (with just Acknowledgment receipt of extension filing on hand)?

Thanks in advance! Apologies for asking so many questions together.

[jairichi]

1. Even though you can join based on H1B transfer receipt notice it is wise to wait for approval.

2. Yes, if you have not stayed in US on H1B for 6 years.

3. Depends on how easy you can find an employer willing to sponsor a cap exempt H1B petition.

4. No, you need approval notice.