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It is too heavy for us to move .这里的for us当句子的什么成份,能不能省略?

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It is too heavy for us to move .这里的for us当句子的什么成份,能不能省略?
It is too heavy for us to move .这里的for us当句子的什么成份,能不能省略?
此句中,It是形式主语,句子真正的主语是动词不定式to move,（这样可以使句子显得不会头重脚轻）,is 是系动词,heavy形容词作表语,是个主系表结构的句子,for us 应该是做表语的补足语,若删去,对句子成分影响不大,但可能会影响句意.明白木有?
The problem is too difficult for us to solve it. 这个句子里面的it 为 帮忙分析一下句子的成分 It's too dark for us to see anything for us作表语吗? It is thoutful of you to play CDs for us 分析这个句子的成分,以及问一下,这里的 I think it important for us to do something 什么情况下is可以省略吗? The box is too heavy,for me to move.意思 GOD NEVER GIVES A CROSS THAT IS TOO HEAVY FOR US TO BEAR It is important for us to ______. it is easy for me to do sth.中的for me 在句子中当什么成份 The room is too smalll for us to live in的两个同义句 The ice is too thin for us to skate on.的同义句（2） l found it important for us to listen carefully in class这里的i 到底是it is important to us 还是it is important for us两者的区别是社么啊?