填空题 下面是关于Tom学英语的三对句子。每对句子中，第一句是原句，第二句是对第一句的改写。要求根据原句和第二句中已经给出的部分补全第二句。(注意，不能改变原句的意思。)

填空题 Tom began to learn English when he was very young.
Tom began to learn English 1 2 3 4.

填空题 He learned from his mother.
His mother 1 him.

填空题 With hard work, his English becomes better and better.
His English 1 2 with hard work.