I could play football very well when l was younger改成用he作主语.

问题描述:

I could play football very well when l was younger改成用he作主语.
这个句子该怎么变?为什么?

He could play football very well when he was younger.这里could 后面要用动词原形.这样的话只要吧人称换掉就好了