he began ro learn English when he was six years old.改为同义句

问题描述:

he began ro learn English when he was six years old.改为同义句
he began ro learn English when he was six years old.
he began ro learn English ____six.
抱歉!画错了 有四个空格

at the age of,不会错的!
还有began to learn,不是began ro learn !