When my brother begins to study hard is a good thing怎么改错?

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When my brother begins to study hard is a good thing怎么改错?

When my brother begins to study hard is a good thing怎么改错?
When my brother begins to study hard is a good thing
怎么改错?

When my brother begins to study hard is a good thing怎么改错?
When改成“That",用that引导此主语从句.