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

来源：学生作业帮编辑：大师作文网作业帮分类：英语作业时间：2024/11/16 11:22:22

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
再问： he seems to be studying it
能分析下这句的语法成份么？主谓宾
再答： he 是主语，seem 是谓语

to do sth,to be doing 都是不定式做宾语
再问： to be doing中为什么要用be可以这么说么:he seems to studying it
再答：不能说to studying it
因为，这里的to 是不定式符号，不是介词的to,不定式符号必须跟动词原型

因此，要表示这个现在进行时的状态的意思，studying 前要加动词原型的be ,光一个studying 只是形容词性质的现在分词，不是动词

这里的seem to be doing ,其实就是相当于to do sth +be doing sth,叫不定式的进行式

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