The following question ask you to describe a grammar in complete English statements. We've done an example for you below to give you an idea.

Example:

SaSa

Sb

Answer: This grammar defines the language consisting of strings which have N a's (where N 0) followed by one b, followed by N a's

Question:

S ABCD

A a aA

B Bb b

C bC

C b

D a

D aD