Find CFGs that generate these regular languages over the alphabet = {a b}: (i) The language defined by (aaa + b)*. (ii) The language

Find CFGs that generate these regular languages over the alphabet Σ = {a  b}:
(i) The language defined by (aaa + b)*.
(ii) The language defined by (a + b)*(bbb + aaa)(a + b)*.
(iii) All strings without the substring aaa.
(iv) All strings that end in b and have an even number of b's in total.
(v) The set of all strings of odd length.
(vi) All strings with exactly one a or exactly one b.
(vii) All strings with an odd number of a's or an even number of b's.