用make a living by doing sth造句,三个句子…… （可选主语：I、father、mother（主

用make a living by doing sth造句,三个句子…… （可选主语：I、father、mother（主语放在哪里?）

主语放在句子开头.
1.I make a living by selling book.
2.Father makes a living by fishing.
3.Mother makes a living by working as a teacher.