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

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

题目
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?
答案
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
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