EAD for H4 validity when h1 extension, h4 extension and ead for h4 pending.

[KarBabu]

My ead for h4 expires on dec 20.

1. Can I continue to work when my ead for h4 is pending?

2. If the answer is no for above question,

a. can I be in payroll and take leave of absence(time off, unpaid)- no pay on payroll, till I get my ead card.