He must practise more to laern English better.划线提问(to laern English better)

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He must practise more to laern English better.划线提问(to laern English better)

He must practise more to learn English better.(划线提问to learn English better)
What must he practise more for?
为什么他要多练习?
这是对目的状语不定式提问,是原因.