Vlan on MT is some complicated. There are may post on the forum here with example.
What you request can be done. Look at this Visio, it’s some what you do request.
http://forum.mikrotik.com/t/sofware-vlan-bridge-on-ruteros-explained/122534/1
Vlan 1 runs untaged in the bridge, and vlan 20 run tagged. Both with its on Default GW
10.10.1.1 for VLAN1
10.10.20.1 for VLAN20