Considering the information presented in the chapter as well as the lecture, provide your thoughts on the following conceptual questions. For each concept you are asked to explain, answer in approximately 1-2 sentences. Examples should be brief, approximately 4-5 sentences.

1/ What are the advantages of Extended BNF (EBNF) over BNF for grammar? For a Given BNF: :: = true | false | | not | | Give equivalent EBNF.

2/ Give unambiguous grammar for nested if-then-else structure. Using the same unambiguous grammar show how we can parse the following structure of if then else statement: if E1 then if E2 then S1 else S2 else S3.