1.What's his r for giving up English?

1.What's his r for giving up English?
1.What's his r for giving up English?

1.What's his r for giving up English?
reason 他放弃英语的原因是什么 reason for doing 做某事的原因

reason理由

reason他放弃英语的原因是什么

reason
他放弃英语的原因是什么？