求语法解析!he seems to be studying it .这句中的to be studying为什么这么用,我知道有seem to do sth,这里的为什么用be doing 它在句中做什么成份?这句和he seems to study it有什么区别?

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求语法解析!heseemstobestudyingit.这句中的tobestudying为什么这么用,我知道有seemtodosth,这里的为什么用bedoing它在句中做什么成份?这句和heseem

求语法解析!he seems to be studying it .这句中的to be studying为什么这么用,我知道有seem to do sth,这里的为什么用be doing 它在句中做什么成份?这句和he seems to study it有什么区别?
求语法解析!
he seems to be studying it .这句中的to be studying为什么这么用,我知道有seem to do sth,这里的为什么用be doing 它在句中做什么成份?这句和he seems to study it有什么区别?

求语法解析!he seems to be studying it .这句中的to be studying为什么这么用,我知道有seem to do sth,这里的为什么用be doing 它在句中做什么成份?这句和he seems to study it有什么区别?
这个seem to do sth 意思是似乎要去做什么事情(这个事情还没做)
seem to be doing 意思是似乎正在做某事
he seems to be studying it ,意思是,他似乎正在学习
he seems to study it ,意思强调他似乎打算去学习

he seems to study 强调动作
he seems to be studying 强调状态

只是把seem to do sth和现在进行时一起使用了
he seems to study 是一般现在时 没有正在进行的意思
你给的例子是说他看起来正在学习
只是时态的区别