关于主语补足语① He was seen to come upstairs.② The professor was seen making an experiment in the chemistry lab.请问一下为什么一个后面有"TO"一个没有?这有没有涉及什么语法呢?

关于主语补足语① He was seen to come upstairs.② The professor was seen making an experiment in the chemistry lab.请问一下为什么一个后面有TO一个没有?这有没有涉及什么语法呢? 关于主语补足语的问题.U are supposed to do sth.这里to do sth是不是主语补足语,A child was seen to enter the building.to enter the building是主语补足语吗?U will be helped to push the cart.to push the cart.主语补足语? 主语补足语!在线等!he was last seen playing near the river 问题一 这句话翻译过来怎么是 有人最后一次看见他在河附近玩? 是怎么个翻译法的?问题二 he是主语 was last seen是谓语?对不?问题三 playin He was found the right man for the job.首先看不懂,其后主语补足语在哪啊 he was forced to sign the document请问这里的不定式是作为主语补足语吗? 什么是主语补足语? 什么是主语补足语? 主语补足语He lay awake all nightHe lay awake all nightawake是主语补足语吗?为什么这样用?》 关于主语补足语和状语的问题.主语补足语和状语怎么区分.比如这一句：He came back,out of humor.这一句中的out of humor应为主语补足语.但说他是状语为什么不行.再比如这一句：He came back,tired.为 现在分词做宾语补足语转化为被动语态时要变成不定式吗 例如 we saw him sleeping in the room 怎么变被动是变成 he was seen sleeping 还是 he was seen to sleep 还是 he was seen sleep 主语补足语的定义? 什么是主语谓语补足语 1主语补语指在带宾语补足语的结构变成被动语态后,原来的宾补,如：　　a.He was made to study hard what he was not good at.to study hard what he was not good at就是主语he的主语补语.那么对We arrive home sound and It was caught alive.其中“alive”是做状语还是主语补足语~ 主语补足语与宾语补足语的区别 宾语补足语,主语补足语各是什么? 主语补足语和定语的区别 什么是主语补足语?各位高手帮帮忙