Please help!!

1) (12 points) Given the grammar below, identify the validity of each sentence and demo your proof for each sentence (0 point if you have an answer without a proof) I. baab II. bbbab IIII. bbaab 2) (12 points) Identify all of the tokens in the grammar below, and which lexemes they categorize (put them in a table) l eids 3) (10 points) Given the grammar from question 2, show a left-most derivation (step by step) and draw the parse tree for the following statement B=B+(C + (A * A) ) 4) (10 points) Remove the recursion from the following grammar. Clearly add proper comments/explanations for your steps S-Aa | Bb C-> C