1.  a
    ava
    avava
    avavava
    avavavava................

        a(va)*

        S -> aA
        A -> eps | vaA

        S -> a | SvS

        S -> a | avS

        S -> a | Sva



2.  ap
    apap
    apapap
    apapapap
    apapapapap....................

        (ap)+
        ap(ap)*

        S -> apA
        A -> eps | S

        S -> ap | apS

        S -> SS | ap

        S -> apS | ap

        S -> Sap | ap


3.  helyes zárójelezések nyelve

    ()
    (())
    ()()
    (())()
    (((((((((((((((()))))))()))))()(((())()())))))))

        S -> (S) | SS | eps

        S -> (S)S | eps

        S -> S(S) | eps