These three are related and I need help with them. Can someone explain the steps to solve these.

The next three problems use languages L1 and L2 are defined by the following CFG's:

G1:

A 0A | 1A | 0

G2:

B C | CB

C a | aCb

8) Write a CFG for the union of L1 and L2

9) Write a CFG for the union of L1 concatenate L2

10) Write a CFG for L2*

The next three problems use languages Ll and L2 are defined by the following CFG' s: 8) Write a CFG for the union of Ll and L2 9) Write a CFG for the union of Ll concatenate L2 10) Write a CFG for L2*