这个男孩五岁就会骑自行车了译英两种

问题描述:

这个男孩五岁就会骑自行车了译英
两种

This boy could ride a bike at the age of five.
This boy could ride a bike when he was five years old
could可改为was able to

The boy could ride a bike,when he was five years old.

This boy is able to ride a bike since he was five.

The boy learned to ride a bike when he was five.