He will be in his small boat ,Topsail .为什么有be in ,它有什么作用

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He will be in his small boat ,Topsail .为什么有be in ,它有什么作用

He will be in his small boat ,Topsail .为什么有be in ,它有什么作用
He will be in his small boat ,Topsail .
为什么有be in ,它有什么作用

He will be in his small boat ,Topsail .为什么有be in ,它有什么作用
看情况,不过大部分时候两者都可以用.